On 9/21/2021 1:31 PM, John Larkin wrote:> On Tue, 21 Sep 2021 10:05:03 -0700 (PDT), "ke...@kjwdesigns.com" > <keith@kjwdesigns.com> wrote: > >> ... >>> Here is a sine oscillator. >>> >>> https://www.dropbox.com/s/wqygdxrcr2egxsv/AGC_Sine_Osc.jpg?raw-1 >>> >>> The output amplitude is very stable with time and temperature. The >>> voltage at the collector is reliably 2xV+ p-p. >>> >>> I invented this when I was a kid, still in college. It was used in the >>> Boresight Alignment Kit for the C5A. >>> ... >> >> That configuration is usually known as a Reinartz oscillator. It has been commonly used as a self-oscillating mixer in transistor radios since the mid nineteen-fifties. >> >> In the common implementation the resonant tank is on the secondary rather than the collector to give some isolation from variation of transistor parameters and improve stability. >> >> https://www.electronics-notes.com/images/transistor-radio-self-oscillating-mixer-ferrite-rod-antenna.png >> >> kw > > My circuit is clearly different. It's way simpler and has a built-in > AGC system that precisely controls oscillation amplitude. > > I used it as the excitation for a Talyvel arc-second-resolution > inclinometer, basically an LVDT on a pendulum. > > It was fun to work with. I tested it on a steel plate sitting on a > 55-gallon drum full of rocks. I could see people walking around and > flexing the concrete slab building. > > Hey, they still make them! > > https://scigate.com.sg/products/43-taylor-hobson/2661-electronic-levels-clinometers?pdt=true > >It works OK to put out ~150 volts thru a small toroid transformer you could wind by hand, into a bridge doubler. I use 4.7uH for the primary, 220u for the secondary, 1u for the feedback, 0.47u for the tank cap, 680 ohms and 2.2u for the AGC RC. Probably any 30 volt 3 amp NPN would work OK The frequency of oscillation is about 100kHz and efficiency looks to be 70-something percent, I don't think you could hope for much more from this topology in a high step-up ratio arrangement, as the base transistor burns a fair amount of power to give the Q sufficient drive. I don't think Schottky diodes are really needed here but we got 'em. (make sure "alternate solver" is turned on, the normal solver hates these type of circuits) Version 4 SHEET 1 1148 680 WIRE -416 -752 -496 -752 WIRE 112 -752 -416 -752 WIRE -416 -624 -416 -752 WIRE -48 -624 -416 -624 WIRE 480 -624 320 -624 WIRE 784 -624 544 -624 WIRE 912 -624 784 -624 WIRE 1056 -624 912 -624 WIRE -672 -576 -672 -624 WIRE 400 -528 224 -528 WIRE 480 -528 400 -528 WIRE 784 -528 784 -624 WIRE 784 -528 544 -528 WIRE 224 -480 224 -528 WIRE 784 -464 784 -528 WIRE -672 -448 -672 -496 WIRE 912 -400 912 -624 WIRE 1056 -368 1056 -624 WIRE -48 -352 -48 -624 WIRE 112 -336 112 -752 WIRE 224 -336 224 -400 WIRE 320 -336 320 -624 WIRE 320 -336 224 -336 WIRE 784 -336 784 -400 WIRE 784 -336 320 -336 WIRE 784 -272 784 -336 WIRE 400 -208 400 -528 WIRE 480 -208 400 -208 WIRE 608 -208 544 -208 WIRE -416 -176 -416 -624 WIRE 320 -112 320 -336 WIRE 480 -112 320 -112 WIRE 608 -112 608 -208 WIRE 608 -112 544 -112 WIRE 784 -112 784 -208 WIRE 784 -112 608 -112 WIRE 912 -112 912 -336 WIRE 912 -112 784 -112 WIRE 1056 -112 1056 -288 WIRE 1056 -112 912 -112 WIRE -48 -96 -48 -272 WIRE -48 -96 -288 -96 WIRE 112 -96 112 -272 WIRE 112 -96 -48 -96 WIRE 784 -80 784 -112 WIRE 784 -64 784 -80 WIRE -288 0 -288 -96 WIRE 784 32 784 0 WIRE -416 48 -416 -96 WIRE -352 48 -416 48 WIRE -416 160 -416 48 WIRE -288 160 -288 96 WIRE -416 288 -416 224 WIRE -288 288 -288 240 FLAG -496 -752 +5 IOPIN -496 -752 In FLAG -288 288 0 FLAG -672 -448 0 FLAG -672 -624 +5 IOPIN -672 -624 Out FLAG 784 32 0 FLAG -416 288 0 SYMBOL ind2 -32 -368 M0 WINDOW 3 -49 82 Left 2 SYMATTR InstName L1 SYMATTR Value 4.7µ SYMBOL ind2 240 -496 M0 SYMATTR InstName L2 SYMATTR Value 220µ SYMBOL ind2 -304 256 M180 WINDOW 0 36 80 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName L3 SYMATTR Value 1µ SYMBOL npn -352 0 R0 SYMATTR InstName Q1 SYMATTR Value 2SCR553P SYMBOL cap 128 -272 R180 WINDOW 0 24 56 Left 2 WINDOW 3 -86 38 Left 2 SYMATTR InstName C1 SYMATTR Value 0.47µ SYMBOL res -400 -80 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R3 SYMATTR Value 680 SYMBOL cap -400 224 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C2 SYMATTR Value 2.2µ SYMBOL voltage -672 -592 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL cap 768 -272 R0 SYMATTR InstName C3 SYMATTR Value 0.1µ SYMBOL res 768 -96 R0 SYMATTR InstName R1 SYMATTR Value 1Meg SYMBOL current 1056 -368 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName I1 SYMATTR Value 0.005 SYMBOL cap 768 -464 R0 SYMATTR InstName C4 SYMATTR Value 0.1µ SYMBOL cap 896 -400 R0 SYMATTR InstName C5 SYMATTR Value 0.47µ SYMBOL schottky 544 -128 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D4 SYMATTR Value RB168L150 SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 544 -224 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value RB168L150 SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 480 -608 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D2 SYMATTR Value RB168L150 SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 480 -512 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D3 SYMATTR Value RB168L150 SYMATTR Description Diode SYMATTR Type diode TEXT -816 -328 Left 2 !.tran 10m startup uic TEXT -792 -360 Left 2 !K L1 L2 L3 0.99
Turbo Royer/Baxandall in boost configuration
Started by ●September 20, 2021
Reply by ●September 21, 20212021-09-21
Reply by ●September 21, 20212021-09-21
On 9/21/2021 2:01 PM, bitrex wrote:> On 9/21/2021 1:31 PM, John Larkin wrote: >> On Tue, 21 Sep 2021 10:05:03 -0700 (PDT), "ke...@kjwdesigns.com" >> <keith@kjwdesigns.com> wrote: >> >>> ... >>>> Here is a sine oscillator. >>>> >>>> https://www.dropbox.com/s/wqygdxrcr2egxsv/AGC_Sine_Osc.jpg?raw-1 >>>> >>>> The output amplitude is very stable with time and temperature. The >>>> voltage at the collector is reliably 2xV+ p-p. >>>> >>>> I invented this when I was a kid, still in college. It was used in the >>>> Boresight Alignment Kit for the C5A. >>>> ... >>> >>> That configuration is usually known as a Reinartz oscillator. It has >>> been commonly used as a self-oscillating mixer in transistor radios >>> since the mid nineteen-fifties. >>> >>> In the common implementation the resonant tank is on the secondary >>> rather than the collector to give some isolation from variation of >>> transistor parameters and improve stability. >>> >>> https://www.electronics-notes.com/images/transistor-radio-self-oscillating-mixer-ferrite-rod-antenna.png >>> >>> >>> kw >> >> My circuit is clearly different. It's way simpler and has a built-in >> AGC system that precisely controls oscillation amplitude. >> >> I used it as the excitation for a Talyvel arc-second-resolution >> inclinometer, basically an LVDT on a pendulum. >> >> It was fun to work with. I tested it on a steel plate sitting on a >> 55-gallon drum full of rocks. I could see people walking around and >> flexing the concrete slab building. >> >> Hey, they still make them! >> >> https://scigate.com.sg/products/43-taylor-hobson/2661-electronic-levels-clinometers?pdt=true >> >> >> > > It works OK to put out ~150 volts thru a small toroid transformer you > could wind by hand, into a bridge doubler. I use 4.7uH for the primary, > 220u for the secondary, 1u for the feedback, 0.47u for the tank cap, 680 > ohms and 2.2u for the AGC RC. > > Probably any 30 volt 3 amp NPN would work OK > > The frequency of oscillation is about 100kHz and efficiency looks to be > 70-something percent, I don't think you could hope for much more from > this topology in a high step-up ratio arrangement, as the base > transistorBase resistor, rather
Reply by ●September 21, 20212021-09-21
On 9/21/2021 11:59 AM, jlarkin@highlandsniptechnology.com wrote:> On Tue, 21 Sep 2021 06:32:35 GMT, Jan Panteltje > <pNaonStpealmtje@yahoo.com> wrote: > >> On a sunny day (Mon, 20 Sep 2021 17:45:12 -0400) it happened bitrex >> <user@example.net> wrote in <Jh72J.114246$Kv2.67276@fx47.iad>: >> >>> Is it possible to take your standard Baxandall and tap the capacitor, >>> take an aux winding off the secondary and feed a somewhat higher DC >>> voltage to the cap (through the usual two-diode supply handoff >>> arrangement), and use it to feed the gate drive to the transistors as >>> well, which would be clocked rather than self-oscillating. >>> >>> The goal would be to have a quiet step-up converter that could do say 5 >>> to ~150 in one step, or maybe with a single multiplier stage. That seems >>> hard to do with anything off the shelf as compact pulse transformers >>> with the appropriate turns ratio don't seem to be really available, you >>> get into CFL-type transformers whose ratios are too large, but there >>> might be something appropriate with a third winding to bootstrap the >>> primary swing >> >> High ratio transformers are easy with UI or E cores >> I wind the small ones with thin seundary on the dremel... >> Just count... >> http://panteltje.com/pub/home_made_1_to_33_hv_transformer_img_3096.jpg >> >> 12V DC to approx 440 Vpp 20 to 44 kHz: >> http://panteltje.com/pub/ultrasonic_antifouling_bigger_transformer_IMG_5179.JPG >> http://panteltje.com/pub/ultrasonic_anti_fouling_test_board_IMG_5135.JPG >> >> Not to mention all the TV high voltage flyback stuff.. >> and what a little BC107 or so can do: >> http://panteltje.com/pub/new_transformer_test_setup_img_3153.jpg >> >> Have no fear of transformers.... >> http://panteltje.com/pub/PMT_HV_supply_with_regulator_img_3175.jpg >> http://panteltje.com/pub/PMT_HV_supply_componet_side_img_3180.jpg >> >> This uses a standard 1:10 audio? transformer flyback to power a GMtube: >> http://panteltje.com/panteltje/pic/gm_pic2/ >> seems quiet.... Even has GPS >> >> so many projects with transformers... > > Transformers are wonderful, as long as you don't wind them. You can > easily turn a 2-minute 50-cent part into 1000x those numbers.If you have a design with a transformer that can be wound on a small toroid in a couple minutes, and you have a girlfriend that enjoys knitting, then you have new employee
Reply by ●September 21, 20212021-09-21
On 9/21/2021 2:06 PM, bitrex wrote:> On 9/21/2021 11:59 AM, jlarkin@highlandsniptechnology.com wrote: >> On Tue, 21 Sep 2021 06:32:35 GMT, Jan Panteltje >> <pNaonStpealmtje@yahoo.com> wrote: >> >>> On a sunny day (Mon, 20 Sep 2021 17:45:12 -0400) it happened bitrex >>> <user@example.net> wrote in <Jh72J.114246$Kv2.67276@fx47.iad>: >>> >>>> Is it possible to take your standard Baxandall and tap the capacitor, >>>> take an aux winding off the secondary and feed a somewhat higher DC >>>> voltage to the cap (through the usual two-diode supply handoff >>>> arrangement), and use it to feed the gate drive to the transistors as >>>> well, which would be clocked rather than self-oscillating. >>>> >>>> The goal would be to have a quiet step-up converter that could do say 5 >>>> to ~150 in one step, or maybe with a single multiplier stage. That >>>> seems >>>> hard to do with anything off the shelf as compact pulse transformers >>>> with the appropriate turns ratio don't seem to be really available, you >>>> get into CFL-type transformers whose ratios are too large, but there >>>> might be something appropriate with a third winding to bootstrap the >>>> primary swing >>> >>> High ratio transformers are easy with UI or E cores >>> I wind the small ones with thin seundary on the dremel... >>> Just count... >>> http://panteltje.com/pub/home_made_1_to_33_hv_transformer_img_3096.jpg >>> >>> 12V DC to approx 440 Vpp 20 to 44 kHz: >>> http://panteltje.com/pub/ultrasonic_antifouling_bigger_transformer_IMG_5179.JPG >>> >>> http://panteltje.com/pub/ultrasonic_anti_fouling_test_board_IMG_5135.JPG >>> >>> Not to mention all the TV high voltage flyback stuff.. >>> and what a little BC107 or so can do: >>> http://panteltje.com/pub/new_transformer_test_setup_img_3153.jpg >>> >>> Have no fear of transformers.... >>> http://panteltje.com/pub/PMT_HV_supply_with_regulator_img_3175.jpg >>> http://panteltje.com/pub/PMT_HV_supply_componet_side_img_3180.jpg >>> >>> This uses a standard 1:10 audio? transformer flyback to power a GMtube: >>> http://panteltje.com/panteltje/pic/gm_pic2/ >>> seems quiet.... Even has GPS >>> >>> so many projects with transformers... >> >> Transformers are wonderful, as long as you don't wind them. You can >> easily turn a 2-minute 50-cent part into 1000x those numbers. > > If you have a design with a transformer that can be wound on a small > toroid in a couple minutes, and you have a girlfriend that enjoys > knitting, then you have new employee >But overall I think those USB transformers might be more pragmatic and relationship-friendly
Reply by ●September 21, 20212021-09-21
On Tue, 21 Sep 2021 10:31:44 -0700, John Larkin <jlarkin@highland_atwork_technology.com> wrote:>On Tue, 21 Sep 2021 10:05:03 -0700 (PDT), "ke...@kjwdesigns.com" ><keith@kjwdesigns.com> wrote: > >>... >>> Here is a sine oscillator. >>> >>> <https://www.dropbox.com/s/wqygdxrcr2egxsv/AGC_Sine_Osc.jpg?raw-1 > >>> >>> The output amplitude is very stable with time and temperature. The >>> voltage at the collector is reliably 2xV+ p-p. >>> >>> I invented this when I was a kid, still in college. It was used in the >>> Boresight Alignment Kit for the C5A. >>>...It sort-of reminds me of the oscillator in the original touch-tone dial pad, although the AGC was a pair of silicon diodes in anti-parallel across a winding somewhere. The circuit had power gain, but no voltage gain, as I recall. Hmm. I think the feedback path was from emitter back to base of a single germanium transistor, biased using the drop across a silicon diode. I have that circuit diagram somewhere. I think it was published in the BSTJ.>>That configuration is usually known as a Reinartz oscillator. It has been commonly used as a self-oscillating mixer in transistor radios since the mid nineteen-fifties. >> >>In the common implementation the resonant tank is on the secondary rather than the collector to give some isolation from variation of transistor parameters and improve stability. >> >>.<https://www.electronics-notes.com/images/transistor-radio-self-oscillating-mixer-ferrite-rod-antenna.png> >> >>kw > >My circuit is clearly different. It's way simpler and has a built-in >AGC system that precisely controls oscillation amplitude. > >I used it as the excitation for a Talyvel arc-second-resolution >inclinometer, basically an LVDT on a pendulum. > >It was fun to work with. I tested it on a steel plate sitting on a >55-gallon drum full of rocks. I could see people walking around and >flexing the concrete slab building. > >Hey, they still make them! > >.<https://scigate.com.sg/products/43-taylor-hobson/2661-electronic-levels-clinometers?pdt=true>I think that they are optical now, versus ~LVDT. The original economic niche in machine shops has been taken over by optical autocollimators. But there are still big things like bridges. .<https://en.wikipedia.org/wiki/Autocollimator> Joe Gwinn
Reply by ●September 21, 20212021-09-21
21.09.21 08:32, Jan Panteltje wrote:>On a sunny day (Mon, 20 Sep 2021 17:45:12 -0400) it happened bitrex ><user@example.net> wrote in <Jh72J.114246$Kv2.67276@fx47.iad>: > >>Is it possible to take your standard Baxandall and tap the capacitor, >>take an aux winding off the secondary and feed a somewhat higher DC >>voltage to the cap (through the usual two-diode supply handoff >>arrangement), and use it to feed the gate drive to the transistors as >>well, which would be clocked rather than self-oscillating. >> >>The goal would be to have a quiet step-up converter that could do say 5 >>to ~150 in one step, or maybe with a single multiplier stage. That seems >>hard to do with anything off the shelf as compact pulse transformers >>with the appropriate turns ratio don't seem to be really available, you >>get into CFL-type transformers whose ratios are too large, but there >>might be something appropriate with a third winding to bootstrap the >>primary swing > >High ratio transformers are easy with UI or E cores >I wind the small ones with thin seundary on the dremel... >Just count... > http://panteltje.com/pub/home_made_1_to_33_hv_transformer_img_3096.jpg > >12V DC to approx 440 Vpp 20 to 44 kHz: > http://panteltje.com/pub/ultrasonic_antifouling_bigger_transformer_IMG_5179.JPG > http://panteltje.com/pub/ultrasonic_anti_fouling_test_board_IMG_5135.JPG > >Not to mention all the TV high voltage flyback stuff.. >and what a little BC107 or so can do: > http://panteltje.com/pub/new_transformer_test_setup_img_3153.jpg > >Have no fear of transformers.... > http://panteltje.com/pub/PMT_HV_supply_with_regulator_img_3175.jpg > http://panteltje.com/pub/PMT_HV_supply_componet_side_img_3180.jpg > >This uses a standard 1:10 audio? transformer flyback to power a GMtube: > http://panteltje.com/panteltje/pic/gm_pic2/ >seems quiet.... Even has GPS > >so many projects with transformers... >It seems a Halfbridge converter would be a good fit With 5V it's easy to drive, with high frequency the number of turns will be low. Increase efficiency by splitting the winding, maybe add external inductor for resonant LLC operation Drive it from a microcontroller with 50 duty to avoid output inductor or do a phase shifted Halfbridge to be able to regulate the voltage if needed -- Klaus
Reply by ●September 21, 20212021-09-21
On Tue, 21 Sep 2021 14:06:25 -0400, bitrex <user@example.net> wrote:>On 9/21/2021 11:59 AM, jlarkin@highlandsniptechnology.com wrote: >> On Tue, 21 Sep 2021 06:32:35 GMT, Jan Panteltje >> <pNaonStpealmtje@yahoo.com> wrote: >> >>> On a sunny day (Mon, 20 Sep 2021 17:45:12 -0400) it happened bitrex >>> <user@example.net> wrote in <Jh72J.114246$Kv2.67276@fx47.iad>: >>> >>>> Is it possible to take your standard Baxandall and tap the capacitor, >>>> take an aux winding off the secondary and feed a somewhat higher DC >>>> voltage to the cap (through the usual two-diode supply handoff >>>> arrangement), and use it to feed the gate drive to the transistors as >>>> well, which would be clocked rather than self-oscillating. >>>> >>>> The goal would be to have a quiet step-up converter that could do say 5 >>>> to ~150 in one step, or maybe with a single multiplier stage. That seems >>>> hard to do with anything off the shelf as compact pulse transformers >>>> with the appropriate turns ratio don't seem to be really available, you >>>> get into CFL-type transformers whose ratios are too large, but there >>>> might be something appropriate with a third winding to bootstrap the >>>> primary swing >>> >>> High ratio transformers are easy with UI or E cores >>> I wind the small ones with thin seundary on the dremel... >>> Just count... >>> http://panteltje.com/pub/home_made_1_to_33_hv_transformer_img_3096.jpg >>> >>> 12V DC to approx 440 Vpp 20 to 44 kHz: >>> http://panteltje.com/pub/ultrasonic_antifouling_bigger_transformer_IMG_5179.JPG >>> http://panteltje.com/pub/ultrasonic_anti_fouling_test_board_IMG_5135.JPG >>> >>> Not to mention all the TV high voltage flyback stuff.. >>> and what a little BC107 or so can do: >>> http://panteltje.com/pub/new_transformer_test_setup_img_3153.jpg >>> >>> Have no fear of transformers.... >>> http://panteltje.com/pub/PMT_HV_supply_with_regulator_img_3175.jpg >>> http://panteltje.com/pub/PMT_HV_supply_componet_side_img_3180.jpg >>> >>> This uses a standard 1:10 audio? transformer flyback to power a GMtube: >>> http://panteltje.com/panteltje/pic/gm_pic2/ >>> seems quiet.... Even has GPS >>> >>> so many projects with transformers... >> >> Transformers are wonderful, as long as you don't wind them. You can >> easily turn a 2-minute 50-cent part into 1000x those numbers. > >If you have a design with a transformer that can be wound on a small >toroid in a couple minutes, and you have a girlfriend that enjoys >knitting, then you have new employeeEven if said gf enjoys winding toroids, you still have to mount it and identify/strip/terminate the leads. It doesn't take many turns or windings to get nasty. (Mo enjoys knitting, and has made pilgrimages to upstate California and Ireland to meet sheep and get special wool. Turns out there is a famous sheep-shearer in our neighborhood.) Here's a home-made transmission-line transformer, under 1 ns rise time. The connectors are surface-mount and the windings are a Digikey stock connectorized coax jumper. It takes a couple minutes to assemble on a board. https://www.dropbox.com/s/ievtck0gwv1tzd6/TX_1.jpg?raw=1 And this is a heat-sunk air core inductor, wound on a Sharpie pen. https://www.dropbox.com/s/o2hz6oi08agzdy8/T850_Inductor.JPG?raw=1 -- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end in certainties. Francis Bacon
Reply by ●September 21, 20212021-09-21
On Tue, 21 Sep 2021 14:09:16 -0400, bitrex <user@example.net> wrote:>On 9/21/2021 2:06 PM, bitrex wrote: >> On 9/21/2021 11:59 AM, jlarkin@highlandsniptechnology.com wrote: >>> On Tue, 21 Sep 2021 06:32:35 GMT, Jan Panteltje >>> <pNaonStpealmtje@yahoo.com> wrote: >>> >>>> On a sunny day (Mon, 20 Sep 2021 17:45:12 -0400) it happened bitrex >>>> <user@example.net> wrote in <Jh72J.114246$Kv2.67276@fx47.iad>: >>>> >>>>> Is it possible to take your standard Baxandall and tap the capacitor, >>>>> take an aux winding off the secondary and feed a somewhat higher DC >>>>> voltage to the cap (through the usual two-diode supply handoff >>>>> arrangement), and use it to feed the gate drive to the transistors as >>>>> well, which would be clocked rather than self-oscillating. >>>>> >>>>> The goal would be to have a quiet step-up converter that could do say 5 >>>>> to ~150 in one step, or maybe with a single multiplier stage. That >>>>> seems >>>>> hard to do with anything off the shelf as compact pulse transformers >>>>> with the appropriate turns ratio don't seem to be really available, you >>>>> get into CFL-type transformers whose ratios are too large, but there >>>>> might be something appropriate with a third winding to bootstrap the >>>>> primary swing >>>> >>>> High ratio transformers are easy with UI or E cores >>>> I wind the small ones with thin seundary on the dremel... >>>> Just count... >>>> http://panteltje.com/pub/home_made_1_to_33_hv_transformer_img_3096.jpg >>>> >>>> 12V DC to approx 440 Vpp 20 to 44 kHz: >>>> http://panteltje.com/pub/ultrasonic_antifouling_bigger_transformer_IMG_5179.JPG >>>> >>>> http://panteltje.com/pub/ultrasonic_anti_fouling_test_board_IMG_5135.JPG >>>> >>>> Not to mention all the TV high voltage flyback stuff.. >>>> and what a little BC107 or so can do: >>>> http://panteltje.com/pub/new_transformer_test_setup_img_3153.jpg >>>> >>>> Have no fear of transformers.... >>>> http://panteltje.com/pub/PMT_HV_supply_with_regulator_img_3175.jpg >>>> http://panteltje.com/pub/PMT_HV_supply_componet_side_img_3180.jpg >>>> >>>> This uses a standard 1:10 audio? transformer flyback to power a GMtube: >>>> http://panteltje.com/panteltje/pic/gm_pic2/ >>>> seems quiet.... Even has GPS >>>> >>>> so many� projects with transformers... >>> >>> Transformers are wonderful, as long as you don't wind them. You can >>> easily turn a 2-minute 50-cent part into 1000x those numbers. >> >> If you have a design with a transformer that can be wound on a small >> toroid in a couple minutes, and you have a girlfriend that enjoys >> knitting, then you have new employee >> > >But overall I think those USB transformers might be more pragmatic and >relationship-friendlyI like the dual-winding inductors, like DRQ127. You can do all sorts of fun stuff with them. -- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end in certainties. Francis Bacon
Reply by ●September 21, 20212021-09-21
On Tue, 21 Sep 2021 15:15:52 -0400, Joe Gwinn <joegwinn@comcast.net> wrote:>On Tue, 21 Sep 2021 10:31:44 -0700, John Larkin ><jlarkin@highland_atwork_technology.com> wrote: > >>On Tue, 21 Sep 2021 10:05:03 -0700 (PDT), "ke...@kjwdesigns.com" >><keith@kjwdesigns.com> wrote: >> >>>... >>>> Here is a sine oscillator. >>>> >>>> <https://www.dropbox.com/s/wqygdxrcr2egxsv/AGC_Sine_Osc.jpg?raw-1 > >>>> >>>> The output amplitude is very stable with time and temperature. The >>>> voltage at the collector is reliably 2xV+ p-p. >>>> >>>> I invented this when I was a kid, still in college. It was used in the >>>> Boresight Alignment Kit for the C5A. >>>>... > >It sort-of reminds me of the oscillator in the original touch-tone >dial pad, although the AGC was a pair of silicon diodes in >anti-parallel across a winding somewhere. The circuit had power gain, >but no voltage gain, as I recall. Hmm. I think the feedback path was >from emitter back to base of a single germanium transistor, biased >using the drop across a silicon diode. > >I have that circuit diagram somewhere. I think it was published in >the BSTJ.Here it is. They used a germanium transistor and varistors for amplitude control. https://www.dropbox.com/s/br6namqyxas1f02/Bell_DTMF.jpg?dl=0> > >>>That configuration is usually known as a Reinartz oscillator. It has been commonly used as a self-oscillating mixer in transistor radios since the mid nineteen-fifties. >>> >>>In the common implementation the resonant tank is on the secondary rather than the collector to give some isolation from variation of transistor parameters and improve stability. >>> >>>.<https://www.electronics-notes.com/images/transistor-radio-self-oscillating-mixer-ferrite-rod-antenna.png> >>> >>>kw >> >>My circuit is clearly different. It's way simpler and has a built-in >>AGC system that precisely controls oscillation amplitude. >> >>I used it as the excitation for a Talyvel arc-second-resolution >>inclinometer, basically an LVDT on a pendulum. >> >>It was fun to work with. I tested it on a steel plate sitting on a >>55-gallon drum full of rocks. I could see people walking around and >>flexing the concrete slab building. >> >>Hey, they still make them! >> >>.<https://scigate.com.sg/products/43-taylor-hobson/2661-electronic-levels-clinometers?pdt=true> > >I think that they are optical now, versus ~LVDT. > >The original economic niche in machine shops has been taken over by >optical autocollimators. But there are still big things like bridges. > >.<https://en.wikipedia.org/wiki/Autocollimator> > > >Joe Gwinn-- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end in certainties. Francis Bacon
Reply by ●September 21, 20212021-09-21
On 9/21/2021 4:00 PM, John Larkin wrote:> On Tue, 21 Sep 2021 14:06:25 -0400, bitrex <user@example.net> wrote: > >> On 9/21/2021 11:59 AM, jlarkin@highlandsniptechnology.com wrote: >>> On Tue, 21 Sep 2021 06:32:35 GMT, Jan Panteltje >>> <pNaonStpealmtje@yahoo.com> wrote: >>> >>>> On a sunny day (Mon, 20 Sep 2021 17:45:12 -0400) it happened bitrex >>>> <user@example.net> wrote in <Jh72J.114246$Kv2.67276@fx47.iad>: >>>> >>>>> Is it possible to take your standard Baxandall and tap the capacitor, >>>>> take an aux winding off the secondary and feed a somewhat higher DC >>>>> voltage to the cap (through the usual two-diode supply handoff >>>>> arrangement), and use it to feed the gate drive to the transistors as >>>>> well, which would be clocked rather than self-oscillating. >>>>> >>>>> The goal would be to have a quiet step-up converter that could do say 5 >>>>> to ~150 in one step, or maybe with a single multiplier stage. That seems >>>>> hard to do with anything off the shelf as compact pulse transformers >>>>> with the appropriate turns ratio don't seem to be really available, you >>>>> get into CFL-type transformers whose ratios are too large, but there >>>>> might be something appropriate with a third winding to bootstrap the >>>>> primary swing >>>> >>>> High ratio transformers are easy with UI or E cores >>>> I wind the small ones with thin seundary on the dremel... >>>> Just count... >>>> http://panteltje.com/pub/home_made_1_to_33_hv_transformer_img_3096.jpg >>>> >>>> 12V DC to approx 440 Vpp 20 to 44 kHz: >>>> http://panteltje.com/pub/ultrasonic_antifouling_bigger_transformer_IMG_5179.JPG >>>> http://panteltje.com/pub/ultrasonic_anti_fouling_test_board_IMG_5135.JPG >>>> >>>> Not to mention all the TV high voltage flyback stuff.. >>>> and what a little BC107 or so can do: >>>> http://panteltje.com/pub/new_transformer_test_setup_img_3153.jpg >>>> >>>> Have no fear of transformers.... >>>> http://panteltje.com/pub/PMT_HV_supply_with_regulator_img_3175.jpg >>>> http://panteltje.com/pub/PMT_HV_supply_componet_side_img_3180.jpg >>>> >>>> This uses a standard 1:10 audio? transformer flyback to power a GMtube: >>>> http://panteltje.com/panteltje/pic/gm_pic2/ >>>> seems quiet.... Even has GPS >>>> >>>> so many projects with transformers... >>> >>> Transformers are wonderful, as long as you don't wind them. You can >>> easily turn a 2-minute 50-cent part into 1000x those numbers. >> >> If you have a design with a transformer that can be wound on a small >> toroid in a couple minutes, and you have a girlfriend that enjoys >> knitting, then you have new employee > > Even if said gf enjoys winding toroids, you still have to mount it and > identify/strip/terminate the leads. It doesn't take many turns or > windings to get nasty."stripping" enamel wire is the worst, burning and/or sanding more like> (Mo enjoys knitting, and has made pilgrimages to upstate California > and Ireland to meet sheep and get special wool. Turns out there is a > famous sheep-shearer in our neighborhood.) > > Here's a home-made transmission-line transformer, under 1 ns rise > time. The connectors are surface-mount and the windings are a Digikey > stock connectorized coax jumper. It takes a couple minutes to assemble > on a board. > > https://www.dropbox.com/s/ievtck0gwv1tzd6/TX_1.jpg?raw=1Looks like cell phone antenna connectors...> And this is a heat-sunk air core inductor, wound on a Sharpie pen. > > https://www.dropbox.com/s/o2hz6oi08agzdy8/T850_Inductor.JPG?raw=1 >As a kinda interesting mod to your circuit, you can reduce the power in the base resistor for larger step-up ratios if you first increase its value, and then use a tap on the feedback winding to nudge the effective base supply voltage up a bit: <https://imgur.com/a/kezrBm5> Version 4 SHEET 1 1148 680 WIRE -1232 -880 -1360 -880 WIRE -1120 -880 -1232 -880 WIRE -944 -880 -1056 -880 WIRE -752 -880 -944 -880 WIRE -576 -880 -752 -880 WIRE -368 -880 -512 -880 WIRE -128 -880 -368 -880 WIRE -368 -816 -368 -880 WIRE -752 -800 -752 -880 WIRE -128 -800 -128 -880 WIRE -752 -672 -752 -736 WIRE -368 -672 -368 -736 WIRE -1232 -512 -1232 -880 WIRE -560 -512 -1232 -512 WIRE -288 -512 -560 -512 WIRE 256 -496 96 -496 WIRE 560 -496 320 -496 WIRE 688 -496 560 -496 WIRE 832 -496 688 -496 WIRE -1472 -464 -1472 -512 WIRE 176 -400 0 -400 WIRE 256 -400 176 -400 WIRE 560 -400 560 -496 WIRE 560 -400 320 -400 WIRE -944 -352 -944 -880 WIRE -288 -352 -288 -512 WIRE 0 -352 0 -400 WIRE -1472 -336 -1472 -384 WIRE -560 -336 -560 -512 WIRE 560 -336 560 -400 WIRE 688 -272 688 -496 WIRE 832 -240 832 -496 WIRE 0 -208 0 -272 WIRE 96 -208 96 -496 WIRE 96 -208 0 -208 WIRE 560 -208 560 -272 WIRE 560 -208 96 -208 WIRE 560 -144 560 -208 WIRE -560 -96 -560 -272 WIRE -288 -96 -288 -272 WIRE -288 -96 -560 -96 WIRE 176 -80 176 -400 WIRE 256 -80 176 -80 WIRE 384 -80 320 -80 WIRE -288 0 -288 -96 WIRE 96 16 96 -208 WIRE 256 16 96 16 WIRE 384 16 384 -80 WIRE 384 16 320 16 WIRE 560 16 560 -80 WIRE 560 16 384 16 WIRE 688 16 688 -208 WIRE 688 16 560 16 WIRE 832 16 832 -160 WIRE 832 16 688 16 WIRE -944 48 -944 -272 WIRE -352 48 -944 48 WIRE 560 48 560 16 WIRE 560 64 560 48 WIRE 560 160 560 128 WIRE -288 176 -288 96 WIRE -128 176 -128 -720 WIRE -128 176 -288 176 WIRE -944 224 -944 48 WIRE -288 272 -288 176 WIRE -944 416 -944 288 WIRE -288 416 -288 352 FLAG -1360 -880 +5 IOPIN -1360 -880 In FLAG -288 416 0 FLAG -1472 -336 0 FLAG -1472 -512 +5 IOPIN -1472 -512 Out FLAG 560 160 0 FLAG -944 416 0 FLAG -368 -672 0 FLAG -752 -672 0 SYMBOL ind2 -272 -368 M0 WINDOW 3 -49 82 Left 2 SYMATTR InstName L1 SYMATTR Value 4.7µ SYMBOL ind2 16 -368 M0 SYMATTR InstName L2 SYMATTR Value 220µ SYMBOL ind2 -304 368 M180 WINDOW 0 36 80 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName L3 SYMATTR Value 1µ SYMBOL npn -352 0 R0 SYMATTR InstName Q1 SYMATTR Value 2SCR553P SYMBOL cap -544 -272 R180 WINDOW 0 24 56 Left 2 WINDOW 3 -86 38 Left 2 SYMATTR InstName C1 SYMATTR Value 0.47µ SYMBOL res -928 -256 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R3 SYMATTR Value 2.2k SYMBOL cap -928 288 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C2 SYMATTR Value 0.022µ SYMBOL voltage -1472 -480 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL cap 544 -144 R0 SYMATTR InstName C3 SYMATTR Value 0.1µ SYMBOL res 544 32 R0 SYMATTR InstName R1 SYMATTR Value 1Meg SYMBOL current 832 -240 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName I1 SYMATTR Value 0.005 SYMBOL cap 544 -336 R0 SYMATTR InstName C4 SYMATTR Value 0.1µ SYMBOL cap 672 -272 R0 SYMATTR InstName C5 SYMATTR Value 0.47µ SYMBOL schottky 320 0 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D4 SYMATTR Value RB168L150 SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 320 -96 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value RB168L150 SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 256 -480 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D2 SYMATTR Value RB168L150 SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 256 -384 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D3 SYMATTR Value RB168L150 SYMATTR Description Diode SYMATTR Type diode SYMBOL ind2 -144 -704 M180 WINDOW 0 36 80 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName L4 SYMATTR Value 1µ SYMBOL schottky -512 -896 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D6 SYMATTR Value RB168L150 SYMATTR Description Diode SYMATTR Type diode SYMBOL res -384 -832 R0 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL schottky -1120 -864 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D5 SYMATTR Value RB168L150 SYMATTR Description Diode SYMATTR Type diode SYMBOL cap -768 -800 R0 SYMATTR InstName C6 SYMATTR Value 4.7µ TEXT -1464 -216 Left 2 !.tran 30m startup uic TEXT -1432 -248 Left 2 !K L1 L2 L3 L4 0.99
