Popular transistor data in spreadsheet format?

Started by Don Kuenz in sci.electronics.basics8 years ago 3 replies

Greetings, Does anyone know of a spreadsheet (a comma separated variable format is better) that contains data for popular transistors? A...

Greetings, Does anyone know of a spreadsheet (a comma separated variable format is better) that contains data for popular transistors? A single device fills each row, with columns for part number, maximum rating, electrical characteristics, small signal characteristics, and switching characteristics. Thank you, -- Don Kuenz


LTSpice question

Started by Bill Bowden in sci.electronics.basics8 years ago 5 replies

I've noticed some LTSpice simulations indicate a higher than expected transistor current gain (HFE). I drew up a simple emitter follower circuit...

I've noticed some LTSpice simulations indicate a higher than expected transistor current gain (HFE). I drew up a simple emitter follower circuit using a 2N3904 transistor and it indicates the emitter current at 1.6 amps (3 volts across 2 ohms in the emitter) and a base current at 24 milliamps for a HFE gain of 66. I didn't know a little 2N3904 transistor would operate at 1.6 amps and sti...


Transistor substitution

Started by Ivan Vegvary in sci.electronics.basics8 years ago 25 replies

Want to breadboard small circuits from mid 1960's magazine articles. Where on the web can I find today's equivalents for the specified...

Want to breadboard small circuits from mid 1960's magazine articles. Where on the web can I find today's equivalents for the specified transistors and diodes? Just starting to learn solid state stuff. Thanks! Ivan Vegvary


Current mirror

Started by Patrick Chung in sci.electronics.basics8 years ago

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


Differential Amplifier is an input stage of every op-amp

Started by Patrick Chung in sci.electronics.basics8 years ago

Generally, if input stage of an operational amplifier is realized as BJT tr= ansistor differential amplifier, op-amp has smaller slew rate,...

Generally, if input stage of an operational amplifier is realized as BJT tr= ansistor differential amplifier, op-amp has smaller slew rate, smaller volt= age offset and better CMRR. If it's realized as JFET transistor based diffe= rential amplifier, voltage offset is higher, CMRR is smaller but slew rate = is better.=20 Read more: http://www.cirvirlab.com/index.php/tutorials/167-bjt-tran...


Get some perspective. We're FINished.

Started by DecadentLinuxUserNumeroUno in sci.electronics.basics8 years ago 7 replies

Hehehe... Not an obscure reference at all! One of the simplest explanations of the basic operation of a transistor I have ever seen,...

Hehehe... Not an obscure reference at all! One of the simplest explanations of the basic operation of a transistor I have ever seen, however. http://www.intel.com/content/www/us/en/silicon-innovations/standards-22nm-explained-video.html BRL!!


Transistor testing

Started by RobH in sci.electronics.basics2 years ago 15 replies

I have some BC547 transistors which I want to use in a circuit, but according to this: Hook the positive lead from the multimeter to the to...

I have some BC547 transistors which I want to use in a circuit, but according to this: Hook the positive lead from the multimeter to the to the EMITTER (E) of the transistor. Hook the negative meter lead to the BASE (B) of the transistor. For an good NPN transistor, you should see ?OL? (Over Limit). If you are testing PNP transistor, the meter should show a voltage drop between 0.


Wireless phone charger

Started by Steve Wolf in sci.electronics.basics2 years ago 5 replies

Just for fun I thought I would make a wireless phone charger. I'm not reall= y going to use it but I wanted to build it and just see if it...

Just for fun I thought I would make a wireless phone charger. I'm not reall= y going to use it but I wanted to build it and just see if it actually work= ed. The circuit uses two coils and a 2n222 transistor very simple. Well I can't really get it to work maybe I could get half a volt maybe to p= ast through induction. Then it seems to stop. I connected my meter to the r= eceiving coil to t...


Bipolar transistor simplest models

Started by Patrick Chung in sci.electronics.basics7 years ago

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

Even though mechanisms that makes bipolar transistor run are quite complica= ted and there are many side effect to be covered, simple analysis is possi= ble with two simple models: one for active regime, when we use one independ= ent voltage source to model base-emitter p-n junction and one current contr= olled current source to model collector-emitter junction. Another is model = of bipolar...


Transistor-Transistor TTL Logic and Totem pole output

Started by Patrick Chung in sci.electronics.basics7 years ago

By combining basic TTL Logic NAND gate with invertors and other gate any logical function can be realized in TTL technology. TTL family of logic...

By combining basic TTL Logic NAND gate with invertors and other gate any logical function can be realized in TTL technology. TTL family of logic circuits is specially empowered with TTL Totem pole output Read more: http://www.cirvirlab.com/index.php/electronic/181-transistor-transistor-ttl-logic.html


2N3904 maximum ratings Vceo Vcbo

Started by Bill Bowden in sci.electronics.basics7 years ago 25 replies

Is it safe to operate a 2N3904 in a switching application with a supply voltage of 48 volts? The data sheet says Vceo is 40 and Vcbo is 60...

Is it safe to operate a 2N3904 in a switching application with a supply voltage of 48 volts? The data sheet says Vceo is 40 and Vcbo is 60 volts. When the transistor switches off, the collector to emitter voltage will be 48 and the base voltage will be near 0 through a resistor. Any problems with that? --- news://freenews.netfront.net/ - complaints: news@netfront.net ---


CMOS logic

Started by Patrick Chung in sci.electronics.basics7 years ago

By combining P channel and N channel MOSFET transistor, whole new digital technology, CMOS technology is obtained. Read...

By combining P channel and N channel MOSFET transistor, whole new digital technology, CMOS technology is obtained. Read more: http://www.cirvirlab.com/index.php/electronic/184-cmos-logic-gate-circuits.html


Strange LO Oscillator won't oscillate

Started by Bill Bowden in sci.electronics.basics7 years ago 4 replies

It's a Autodyne converter in a small AM Radio. DC voltages look ok but doesn't oscillate. Originally, the problem was a weak transistor with a...

It's a Autodyne converter in a small AM Radio. DC voltages look ok but doesn't oscillate. Originally, the problem was a weak transistor with a hFE of 4. I replaced the tranny with a 2N2222A and it worked fine for a couple weeks and then died. Now the DC voltages look ok with about 1.5 volts on the emitter. Usually, this type of oscillator has the coil tap connected to the emitter throu...


NPN Transistor Question

Started by Jim Thompson in sci.electronics.basics7 years ago 36 replies

Being in the I/C biz, I don't keep up very well with what is available in the discrete transistor world. What I'm looking for is a...

Being in the I/C biz, I don't keep up very well with what is available in the discrete transistor world. What I'm looking for is a _readily_available_ NPN, highest fT, VCE < 15V, IC < 10mA Suggestions? Thanks! ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations


Tube (valve) amplifier question

Started by Anonymous in sci.electronics.basics7 years ago 8 replies

I have decided to build myself a little tube amplifier so I can hear one and compare it to my modern solid state stuff. Virtually all the kits...

I have decided to build myself a little tube amplifier so I can hear one and compare it to my modern solid state stuff. Virtually all the kits and designs I see online are low wattage output compared to the solid state stuff. I read that part of the reason for this is because a tube amp at maximum output distorts the sound in a way that most folks find agreeable whereas transistor amps disto...


Weight of electronic equipment

Started by Veek M in sci.electronics.basics7 years ago 22 replies

I'm importing some electronic parts/equipment (1kg worth) and wanted to compute a reasonable estimate of shipping costs - could someone weigh...

I'm importing some electronic parts/equipment (1kg worth) and wanted to compute a reasonable estimate of shipping costs - could someone weigh their parts and post the values. What are the weights of various types of: Through-hole components: diode, capacitor, inductors, transistor, ICs, crystal, LED, ferrite cores-beads, Potentiometers, Trimpots, Photodiodes/IR, microprocessors, ...


Transistor identification?

Started by DaveC in sci.electronics.basics7 years ago 16 replies

Help with identifying a TO-92 transistor?(at least I think it?s a transistor?) Pretty vanilla-looking with National Semi logo. Marked: NS...

Help with identifying a TO-92 transistor?(at least I think it?s a transistor?) Pretty vanilla-looking with National Semi logo. Marked: NS 444 ST 13903 (The ?NS? is the logo.) Not enough 4?s to make up a standard 2N number, and 13903 looks like a date code? Ideas? Thanks,


Placing noise on mains?

Started by Terry Pinnell in sci.electronics.basics7 years ago 9 replies

Some of the household circuits gadgets I made decades ago have recently been getting activated spuriously. I suspect some sort of interference...

Some of the household circuits gadgets I made decades ago have recently been getting activated spuriously. I suspect some sort of interference or spikes or whatever on the 240 V mains supply. One example is a buzzer in the shed that's normally triggered from a push button in the house - primarily my wife's 'come in for dinner' call. (It's essentially a CMOS monostable, NPN transistor and a ...


smps: AC or pulsed DC fed into transformer?

Started by Anonymous in sci.electronics.basics6 years ago 26 replies

It seems to me that flyback SMPSes use pulsed DC instead of AC. Is this true? For example, here, the transistor simply turns on and off,...

It seems to me that flyback SMPSes use pulsed DC instead of AC. Is this true? For example, here, the transistor simply turns on and off, providing pulses to the transformer, right? http://www.repairfaq.org/sam/smpsbd.gif Would SMPSes be more efficient if their transformers were fed high-frequency AC instead of high-frequency pulsed DC (for example, by using an H-bridge to provide a neg...


AMP, ADC, Transistor Questions!

Started by Anonymous in sci.electronics.basics6 years ago

Hello everyone. I am picking up on a project someone else worked and and I wanted to see if anyone had some ideas on a amplifier and ADC...

Hello everyone. I am picking up on a project someone else worked and and I wanted to see if anyone had some ideas on a amplifier and ADC connection that is being made in their schematic: 1.) See the schematic here: http://i1228.photobucket.com/albums/ee460/MrBlueCalifornia/qustion_zps3ck8j17m.jpg 2.) I am using a differenctial amplifier to measure a signal (U4 and U5 of