About to receive my first 3D printer

Started by Anonymous in sci.electronics.design1 year ago 12 replies

310 x 310 x 450 mm volume. I was thinking about doing an unboxing video. Dual independent head. Getting a laser too.

310 x 310 x 450 mm volume. I was thinking about doing an unboxing video. Dual independent head. Getting a laser too.


Researchers have developed a fully integrated high-power laser on a lithium niobate chip

Started by Jan Panteltje in sci.electronics.design8 months ago

Toward high-powered telecommunication systems: https://www.sciencedaily.com/releases/2022/04/220408113955.htm 60 mW output 60 GHz modulator

Toward high-powered telecommunication systems: https://www.sciencedaily.com/releases/2022/04/220408113955.htm 60 mW output 60 GHz modulator


Cute dpot hack for increased resolution

Started by Phil Hobbs in sci.electronics.design2 years ago 44 replies

So I'm doing a simplified version of the differential laser noise canceller, which in the spherical cow universe looks like it does very well...

So I'm doing a simplified version of the differential laser noise canceller, which in the spherical cow universe looks like it does very well out to about 10 MHz, thanks to the amazing properties of BFP640s and some new photodiodes with reduced series resistance. (At least according to Hamamatsu.) One thing I need for this is an adjustable resistance with good bandwidth. The fastest...


TI opamp

Started by John Larkin in sci.electronics.design8 years ago 46 replies

Has anybody used this one? http://www.ti.com/product/lme49990 Sounds too good to be true. -- John Larkin Highland...

Has anybody used this one? http://www.ti.com/product/lme49990 Sounds too good to be true. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com


OT: More Win7 Crap

Started by Jim Thompson in sci.electronics.design7 years ago 52 replies

OT: More Win7 Crap... Periodically I'm getting "Some printing features are currently unavailable", or some phrase similar to that. Like, I...

OT: More Win7 Crap... Periodically I'm getting "Some printing features are currently unavailable", or some phrase similar to that. Like, I can print to my hp Laser Jet P2015dn, but not be able to select double-sided ?? Never happened with WinXP. Any idea of the cause? ...Jim Thompson -- | James E.Thompson ...


printing with formfeeds

Started by John Larkin in sci.electronics.design2 years ago 26 replies

I have some old assembly listing files that are text, paged by formfeed characters. I can't find a way to print nice listings on a modern laser...

I have some old assembly listing files that are text, paged by formfeed characters. I can't find a way to print nice listings on a modern laser printer/copier. They ignore the formfeeds or print a black box. Any ideas? Maybe I could write a program to replace the ff's with a control sequence or something?


optical phenom

Started by Anonymous in sci.electronics.design8 months ago 15 replies

I had cataract surgery in one eye and will do the other one soon. I have a pretty high power 400 nm laser. If I shoot it at the wall, the dot...

I had cataract surgery in one eye and will do the other one soon. I have a pretty high power 400 nm laser. If I shoot it at the wall, the dot is bright with the repaired plastic-lens eye and invisible with the one that has the cataract. My doctor explained that a cataract absorbs blue light, and that's why some old ladies color their hair bluish-white, because then it looks right to them. ...


pc motherboard grounds

Started by John Larkin in sci.electronics.design10 years ago 115 replies

The mounting holes on PC motherboards: are they usually connected to the PCB ground plane? -- John Larkin ...

The mounting holes on PC motherboards: are they usually connected to the PCB ground plane? -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL d...


it oscillates!

Started by Anonymous in sci.electronics.design3 years ago 54 replies

During this shutdown, I did a little pcb layout for my triggered common-collector Colpitts oscillator, and had some boards fabbed....

During this shutdown, I did a little pcb layout for my triggered common-collector Colpitts oscillator, and had some boards fabbed. A manufacturing person came in today and built a couple for me. It's a triggered 125 MHz oscillator that will be used to time delays in a laser system. We want minimal time jitter so I tried to keep the Q up. The inductor is a Coilcraft Midi-Spring. I used ...


OT: nuclear fusion might not be quite as far off in the future as we've thought.

Started by Bill Sloman in sci.electronics.design3 years ago 61 replies

Today's issue of the Proceedings of the (US) National Academy of Sciences opens with a tolerably interesting...

Today's issue of the Proceedings of the (US) National Academy of Sciences opens with a tolerably interesting article https://www.pnas.org/content/117/4/1824 It's likely to be a more compact solution than ITER, and could get working earlier. There's a guy in Sydney who wants to use a pulsed laser to fuse boron nuclei, who seems to think that he's even closer to a practical solution, but th...


Home lab parts

Started by George Herold in sci.electronics.design3 years ago 99 replies

Hi all, so this is a fun question. I'm buying a bunch of parts from mouser for a home lab. ('Cause they have the laser diodes I want.) So I...

Hi all, so this is a fun question. I'm buying a bunch of parts from mouser for a home lab. ('Cause they have the laser diodes I want.) So I favor through hole parts, (for proto-typing) R's, C's, transistors... R's- 1% MF 0.25W 10,30,...300k, 1M, 10M, 100M (the last two not MF.) C's- COG's 1 pf to ?0.01 uF (1, 3.3, 10..) X7R 0.1uF bypass caps Al-electro 100uF/ 100V 2n4401/03 ...


LED reference current source

Started by John Larkin in sci.electronics.design10 years ago 286 replies

Has anybody done this? https://dl.dropbox.com/u/53724080/Circuits/Isrc_LED.JPG -- John Larkin Highland Technology...

Has anybody done this? https://dl.dropbox.com/u/53724080/Circuits/Isrc_LED.JPG -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links V...


coupled resonators

Started by John Larkin in sci.electronics.design8 years ago 17 replies

Cool visual patterns: https://dl.dropboxusercontent.com/u/53724080/Circuits/Oscillators/Coupled_Resonators.jpg The waveforms decay,...

Cool visual patterns: https://dl.dropboxusercontent.com/u/53724080/Circuits/Oscillators/Coupled_Resonators.jpg The waveforms decay, which must be some Spice setting. Ideal resonators wouldn't lose energy. Gear integration is much worse than trap. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology...


really fast buffers

Started by John Larkin in sci.electronics.design4 years ago 95 replies

I'm designing a test board for a laser controller. Incoming signals, fast 5 volt pulses, will need to get routed to scopes, counters, and some...

I'm designing a test board for a laser controller. Incoming signals, fast 5 volt pulses, will need to get routed to scopes, counters, and some other stuff. It will be kind a maze of connectors and traces and probably relays; it's hard to beat a relay as a test path switch. But life would be a lot better if I could fan out some of the signals at their input connector. I want a zero-delay, ze...


Micrel chip test

Started by Anonymous in sci.electronics.design12 months ago 17 replies

Lately we're doing some small 6-layer boards with breakaway tabs for fixturing. So there can be freebie little circuits that snap off. We...

Lately we're doing some small 6-layer boards with breakaway tabs for fixturing. So there can be freebie little circuits that snap off. We use the Micrel SY88022 laser driver in a few off-label applications, and we don't know enough about it, so I hung a test circuit on an upcoming board. https://www.dropbox.com/s/xu559d7y81n4q6g/T502_SY88.jpg?raw=1 This chip is similar to the Maxim...


Improved capacitance multiplier

Started by Phil Hobbs in sci.electronics.design12 years ago 29 replies

So, I had this application requiring really absurd amounts of ripple rejection--it's a piezo driver in a laser wavelength locker that (for...

So, I had this application requiring really absurd amounts of ripple rejection--it's a piezo driver in a laser wavelength locker that (for historical reasons) has to run off a fairly crappy dual isolated 48V DC-DC converter. The 48V has almost a half volt of ripple at 47 kHz, and the output noise needed to be in the nanovolts. As we've discussed here before, ordinary cap multipliers ar...


BJT base current 1/f noise

Started by Phil Hobbs in sci.electronics.design5 years ago 87 replies

Is horrible. I'm just debugging a nice diode laser controller for one customer and getting ready to do another one for another (much better)...

Is horrible. I'm just debugging a nice diode laser controller for one customer and getting ready to do another one for another (much better) customer. It uses a ZXTP25020 PNP with a biggish degeneration resistor and two-pole bypassing of the base to get low noise at high frequency. Turns out the 1/f noise is atrocious. The total noise from 2 Hz on up is only a couple of PPM, but it sho...


See this Fast pulse circuit.

Started by amdx in sci.electronics.design3 years ago 3 replies

I ran across this thread that starts with, "Here is a simple pulse generator I have made for testing medium BW scopes' rise times. It...

I ran across this thread that starts with, "Here is a simple pulse generator I have made for testing medium BW scopes' rise times. It produces flat top signal with clean and fast rise and fall edges." He uses a MAX3949 Laser Driver to generate the signal. He started with 40 to 50 ps and got a little better each iteration. Also, has better connectors if you need them and some ot...


DDS wisdom

Started by Phil Hobbs in sci.electronics.design8 years ago 152 replies

Hi, all, I have a gig coming in that will have me revisiting my thesis research from nearly 30 years ago, on interferometric laser...

Hi, all, I have a gig coming in that will have me revisiting my thesis research from nearly 30 years ago, on interferometric laser microscopes. (Fun.) Back in the day, I made a nulling-type phase digitizer at 60 MHz by driving a phase shifter with a 12-bit DAC (AD-DAC80), and wrapping a 13-bit successive approximation loop round it (AM2904 with an extra flipflop). With quite a lot ...


the PDP-11 lives!

Started by John Larkin in sci.electronics.design9 years ago 36 replies

http://www.theregister.co.uk/2013/06/19/nuke_plants_to_keep_pdp11_until_2050/ -- John Larkin Highland Technology,...

http://www.theregister.co.uk/2013/06/19/nuke_plants_to_keep_pdp11_until_2050/ -- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME the...