bipolar semiconductor database

Started by legg in sci.electronics.design9 years ago 22 replies

Trying to drum up some interest in bipolar transistor database. Have been proof-reading the contents for some time...

Trying to drum up some interest in bipolar transistor database. Have been proof-reading the contents for some time now. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=300750687460 Not completely finished, but trying to drum up some interest. For those interested, there's an un-proofed list of SMD designators (well, the bipolar transistor lines are 85% checked) there too. RL


NOISE FIGURE OF A BIPOLAR TRANSISTOR

Started by RealInfo in sci.electronics.design9 years ago 45 replies

Hi all In an article about low noise PU preamp for magnetic stylus it was written that the bipolar transistors were chosen for their low...

Hi all In an article about low noise PU preamp for magnetic stylus it was written that the bipolar transistors were chosen for their low noise figure .My question is how exactly a noise figure of a single bip[olar transistor is defined measured . Thanks Elico


Discrete Transistor Equivalents/Crosses

Started by Jim Thompson in sci.electronics.design9 years ago 3 replies

Discrete Transistor Equivalents/Crosses for these devices... XN04401 TRXN4501 I'm search for equivalent devices that also have Spice...

Discrete Transistor Equivalents/Crosses for these devices... XN04401 TRXN4501 I'm search for equivalent devices that also have Spice models. Wringing out an _old_ discrete design :-( ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | ...


Transistor Conversion of Tube Amplifier

Started by Kevin Foster in sci.electronics.design5 years ago 15 replies

The circuit linked below appears to be a conversion of a three stage inverting tube amp tube to a transistor circuit, powered by...

The circuit linked below appears to be a conversion of a three stage inverting tube amp tube to a transistor circuit, powered by 3VDC. https://app.box.com/s/dwflbolnqe58ra9c1kssqjuq14dulxo0 It appears to be intended to capture high frequency ambient signals and re-broadcast them. It may also be designed to self-oscillate to add a carrier wave. In any case, I would like to build it o...


Forward converter question

Started by vkj in sci.electronics.design10 years ago 13 replies

I built a 2-switch forward converter, whcih worked OK but the IGBT switches (IRG4BC20U) failed after a few months (probably because of...

I built a 2-switch forward converter, whcih worked OK but the IGBT switches (IRG4BC20U) failed after a few months (probably because of inadequate heatsinking). WHen I replaced them I must have indavertently stripped the track on the gate of the upper transistor. This made the gate float. When I powered up, it worked at low output but near the max load the upper transistor got fried and the fuse...


Power NPN transistor N344AB

Started by slampen in sci.electronics.design11 years ago 29 replies

Hi, My Peugeot 406 heater blower control module ceased to work the other day, and its power transistor is open. Must be an NPN since it is...

Hi, My Peugeot 406 heater blower control module ceased to work the other day, and its power transistor is open. Must be an NPN since it is supposed to PWM the blower motor to earth (-12V). When searching N344* I find a lot of references to 2N344n.. (2N3440, 2N3442... etc) but not this the exact version. I've uploaded an image of the 'fat' case here: http://kuntigi.net/download/N34...


2 Transistor Buck LED Driver -> Voltage Output

Started by Anonymous in sci.electronics.design6 years ago 20 replies

Hi A while back there was an interesting topic about a 2 transistor Buck LED...

Hi A while back there was an interesting topic about a 2 transistor Buck LED driver: https://groups.google.com/d/topic/sci.electronics.design/BEle8XLEI-I/discussion I tried the LT Spice simulation, but it just runs in linear mode, no switching. Do anyone remember this thread and why it does not run? Tom Swift had the same problem in the original thread: Qoute I changed R1 to 5.1 ...


1 transistor negative resistance circuit Now working Attention Winfield Hill :-)

Started by Jan Panteltje in sci.electronics.design2 years ago 32 replies

1 transistor negative resistance circuit Now working! http://panteltje.com/pub/neg_res_3.gif Note the dip around the middle of the...

1 transistor negative resistance circuit Now working! http://panteltje.com/pub/neg_res_3.gif Note the dip around the middle of the screen. Was wondering 'must be possible'. Solution came to me: Opto coupler. Just put in some resistors, you can do better with other values and other zeners, these are 4.7 V zeners, lowest my spice has. Normally the opto's diode goes on via R2 and R6...


Current mirror

Started by Patrick Chung in sci.electronics.design7 years ago 4 replies

Current mirror is inevitable part of input stage of operational amplifiers. Current mirror behaves almost as perfect current source in small...

Current mirror is inevitable part of input stage of operational amplifiers. Current mirror behaves almost as perfect current source in small current signals application and it has excellent characteristic for bipolar transistor biasing. Read more: http://www.cirvirlab.com/index.php/electronic/165-current-mirror-and-current-source-transistor-b iasing.html


Simple Experimental Kitchen Semiconductor

Started by Globemaker in sci.electronics.design10 years ago 2 replies

A metal insulator gelatin (MIG) transistor is proposed today for my kitchen. The MIG structure forms an enhancement mode field effect transistor...

A metal insulator gelatin (MIG) transistor is proposed today for my kitchen. The MIG structure forms an enhancement mode field effect transistor using an aluminum gate, plastic wrap insulator, over a doped jello substrate. The source and drain are doped with salt while the channel is doped with baking soda. Differential signaling is planned so that leakages are nulled at the LED load. Diod...


PNP for soft switch and reverse battery protection

Started by Peabody in sci.electronics.design5 years ago 66 replies

I'm working on a small circuit that will be powered by a 9V battery. I would like to combine the functions of a soft power switch and reverse...

I'm working on a small circuit that will be powered by a 9V battery. I would like to combine the functions of a soft power switch and reverse battery protection in a single device. I think the answer may be to use a PNP transistor on the high side, with a base resistor to ground - actually to ground through a physical momentary switch, or indirectly to ground via an NPN transistor cont...


Bipolar transistor simplest models

Started by Patrick Chung in sci.electronics.design7 years ago 5 replies

Even though mechanisms that makes bipolar transistor run are quite complicated and there are many side effect to be covered, simple analysis is...

Even though mechanisms that makes bipolar transistor run are quite complicated and there are many side effect to be covered, simple analysis is possible with two simple models: one for active regime, when we use one independent voltage source to model base-emitter p-n junction and one current controlled current source to model collector-emitter junction. Another is model of bipolar


TRANSISTOR SIV300004 needed....

Started by jusme in sci.electronics.design14 years ago 2 replies

or equivalent. I only need one but would like to have some spares. I have looked all over. I would even take a datasheet. Oh, please email...

or equivalent. I only need one but would like to have some spares. I have looked all over. I would even take a datasheet. Oh, please email if you have one/any as I don't check here often. Thanks for any help. j/b


Heatsing for TO263

Started by Piotr Wyderski in sci.electronics.design2 years ago 7 replies

Hi, does this make much sense? http://smartheatsinks.com/SHS_SMT.pdf The heat path between the transistor and the heatsink is...

Hi, does this make much sense? http://smartheatsinks.com/SHS_SMT.pdf The heat path between the transistor and the heatsink is awkward. Best regards, Piotr


Just for fun - Two Transistor LED Buck Switcher

Started by Anonymous in sci.electronics.design7 years ago 66 replies

It's been a while since we've seen ASCII... Fig. 1 ------ R1 Q1 _______ Vin 5.6 2n4403 ...

It's been a while since we've seen ASCII... Fig. 1 ------ R1 Q1 _______ Vin 5.6 2n4403 .-.-.-. 30v> --+-/\/\/-+----+----. .----+---+---' ' ' '-----+----. | | | V / D2| | L1 | | LED1, 3.3W | R2 --- ----- --- R4 220uH +| | NS6W183RT | 470 ^


Cute synth circuit (with explanation)

Started by Tim Williams in sci.electronics.design7 years ago 3 replies

https://youtu.be/tuUMgaKT5aQ Tim -- Seven Transistor Labs Electrical Engineering Consultation Website: http://seventransistorlabs.com

https://youtu.be/tuUMgaKT5aQ Tim -- Seven Transistor Labs Electrical Engineering Consultation Website: http://seventransistorlabs.com


MJ11016 darlington

Started by Jean-Pierre Coulon in sci.electronics.design5 years ago 11 replies

Is there really 40 ohms between the intermadiate point and the emitter? When I do a SPICE simulation the collector current of the second...

Is there really 40 ohms between the intermadiate point and the emitter? When I do a SPICE simulation the collector current of the second transistor is terribly small. Regard, -- Jean-Pierre Coulon


pHEMT

Started by JM in sci.electronics.design5 years ago 5 replies

In talking about pHEMT's, how do *you* pronounce it? I've just had a meeting where "feemt" and "pee-hemt" was used. Since the context was...

In talking about pHEMT's, how do *you* pronounce it? I've just had a meeting where "feemt" and "pee-hemt" was used. Since the context was obvious I stuck with transistor!


Decapping a SOT23

Started by Anonymous in sci.electronics.design1 year ago 31 replies

Hi For fun I need to inspect the die in a typical BC847 SOT23 plastic housing How do one decap that transistor? Cheers Klaus

Hi For fun I need to inspect the die in a typical BC847 SOT23 plastic housing How do one decap that transistor? Cheers Klaus


Sanity check - transistor id

Started by Bob Engelhardt in sci.electronics.design9 years ago 7 replies

A monitor back light supply has a bjt with the marking: C5706. Mouser has an ON bjt, number 2SC5706. Can I assume that they're the...

A monitor back light supply has a bjt with the marking: C5706. Mouser has an ON bjt, number 2SC5706. Can I assume that they're the same? Thanks, Bob