Beta tester for bjt

135

01:09:35

From a project coming from 1971.
Instructions :
1) set npn bjt beta to be measured in EC as you wish, for example =  300.
2) start the simulation with the switch opened and adjust the potentiometer at the bottom until the ammeter in oscilloscope show you 0 or the value closest to zero (balanced bridge).
3) close the switch : read the ammeter value in mA and multiply it by 100. This is the beta value searched. 

The pot at the top (in real a trimmer) is already  adjusted  here and in real was to be adjusted  only once to regulate instrument using an already beta known of bjt ( a measured sample given). 

Real instrument could also works with pnp, inverting power polarity and diode direction via a commutator 

published 6 years ago

lenzrulz

6 years ago

The information you’ve posted isn’t accurate and relevant. There’s been many advancements in BJT technology as I’m sure you’re aware.

kiani

6 years ago

Just shut up lenzulz.. You are full of bulllenz.

giomix

6 years ago

Lenzrulz is a son of greatest bitch, all EC user agree in this, the biggest spammer on EC, he placethe comment above after 5 years. Beware og lenzrulz EC people!

lenzrulz

6 years ago

Who cares, I can write anything and all I need to do is create a little doubt in the minds of users that visit these stupid circuits and they’ll make up their own minds.

giomix

6 years ago

Spammer, say hello to your mother. And your father 😘

giomix

6 years ago

Who visit this post will not have any doubt, but only the certainty that you are 100% pure idiot 😅

lenzrulz

6 years ago

Lol...😂

kiani

6 years ago

Lrnzrulz is anti christ,, uses religeon as cover for msking his bad, disgusting brhaviour plus his hypocrisy the propaganda of his anti humanity........he keeps saying " you can not stop me...",, the exact words of the devil 👿 to God when he disobayed God... Quote from lenzulz.." .You can’t stop me from using this app as I please, ... " ,, {use as I please = misuse } ,,. . 👹

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