Electronic Projects, forums and more.

Go Back   Electronic Circuits Projects Diagrams Free > Electronics Forums > General Electronics Chat


General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion?

Reply
 
LinkBack Thread Tools Display Modes
Old 19th November 2004, 05:22 AM   (permalink)
Default Transistor question

Hello all

If a tansistor shows a very low value for hfe on the mumtimeter than specified in the datasheet,is it true that the transistor has gone bad?
Like 11-12 instead of 125?

Thanks
sandeepa is offline  
Old 19th November 2004, 05:05 PM   (permalink)
Default

haaa haa aaha, and i thought i was the only one :lol: !!

my transistors would show an hfe of 20, when they should be 200. it did this with every single transistor i tried (about 5 or 6). i dont know if my multimeter is broke, or what, but the circuit worked. i wouldnt worry about it.
__________________
I'm no electronics god, i just talk too much.
zachtheterrible is offline  
Old 20th November 2004, 12:22 AM   (permalink)
Default

I think if it measures anything it is probably OK. The specification might be at 1 amp but the meter measures it at 1 ma, so the hfe is low. I measured a 2N930 at 295 and a 2N3904 at 98 but these are low level transistors.
__________________
see my website: www.geocities.com/russlk
Russlk is offline  
Reply

Bookmarks

Thread Tools
Display Modes





All times are GMT. The time now is 11:23 AM.


Electronic Circuits  |  Learning Electronics
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.

eXTReMe Tracker