How to figure out what transistor is used?

[Mark Burnley]

Thanks PRR,

That's interesting...and it does it all without messing about with your DMM and a "wandering" base/gate resistor...has anyone used one "in the field"? I'm designing an in-circuit transistor tester at the moment- with variable parameters so that you can adjust it to allow for in-circuit loading.

My "Big" transistor analyzer is a little big for field use- AVO CT537

Great for characteristic curves- Vce and Ic are fully adjustable, and Iceo can be measured too. Plus it tests PIV of diodes up to 1kV showing leakage.

:thumb:

Mark

 

[NewYorkDave]

Those "hook up any transistor and I'll tell you what it is" checkers have been around for years. You can buy small, cheap ones that fit into a shirtpocket.

 

[Mark Burnley]

Doncha just love living in the future?

:wink:

Mark

 

[Peter Simonsen]

Ohh yes those things has been normal, and pretty standart for years...one can even buy a digital voltmeter these days for next to nothing..that will check npn/pnp trasistors..normally if they work..*GG* and HFE ;-), but theres still quite a long way to go to find the "tell it all"..down to matching it's manufacturer and part number.

ohh its hard to be human..one still has to work...*GGG*

Kind regard

Peter

 

[22busy]

Brad, you're correct about the transistor checkers. I've seen a friend of mine use one in his electronics repair business but I don't recall the manufacturers name. It has 3 alligator clip leads that he can attach in any order to the unknown transistor. After a couple of seconds it displays type (npn or pnp), which lead is which (emitter, collector or base) and gain. I don't remember what else it displays but at least with the above information it would get you in the ballpark.

I'll see if I can get the name of the device.

 

[22busy]

Brad, you're correct about the transistor checkers. I've seen a friend of mine use one in his electronics repair business but I don't recall the manufacturers name. It has 3 alligator clip leads that he can attach in any order to the unknown transistor. After a couple of seconds it displays type (npn or pnp), which lead is which (emitter, collector or base) and gain. I don't remember what else it displays but at least with the above information it would get you in the ballpark.

I'll see if I can get the name of the device.

 

[Peter Simonsen]

[quote author="22busy"] After a couple of seconds it displays type (npn or pnp), which lead is which (emitter, collector or base) and gain.
I'll see if I can get the name of the device.[/quote]

22busy,

Thats pretty normal standart transistor testing you got there..just do a google on transistor tester..hell you can even clone one and DIY ;-)

http://www.google.dk/search?hl=da&ie=UTF-8&q=transistor+tester&spell=1

Kind regards

Peter

 

[tony dB]

Peter, are you suffering from multiple personalitiesyndromes

:green:
:thumb:

Kind kind kind regards,

Tony

 

[Peter Simonsen]

[quote author="tony dB"]Peter, are you suffering from multiple personalitiesyndromes

:green:
:thumb:

Kind kind kind regards,

Tony[/quote]

Tony,

*LOOOOL*...Yep..you got it just right...Guess now its out there..I better see a doc, or something.. Honestly..I dont know what happend..?? Could someone please delete a couple of my multiple personalitiesyndromes postings...I mean this is clearly getting out of hand :grin:

Kind regards

Peter..Peter...Peter...Peter..and Peter ;-)