Need some help matching/calcing germs

[Zben3129]

Hi guys,

Just got 40 germaniums, 20 RCA's and 20 gt133's. I was just wondering how to calculate leakage and gain. I read the guide over at geo, but I couldn't find a plain equation anywhere.

I was using a 9v battery, a 2.4k resistor, and a 2.2m resistor.

For example, before I pressed the switch, I got .112v, and after I pressed the switch, I got .738v

What would the leakage and true gain be on this particular tranny?

Thanks

Zach

[dxm1]

I read the guide over at geo, but I couldn't find a plain equation anywhere.

I don't know if there is an 'equation' in that article, but the procedure is clear enough.

For example, before I pressed the switch, I got .112v, and after I pressed the switch, I got .738v

What would the leakage and true gain be on this particular tranny?

According to the article, .112v would indicate 112uA leakage.  .738 - .112 = .626, times 100 would be about
63 hfe.

R.G. has done a great job with GEO, and I trust most anything published there. If I can't fugure it out, I've found
that it is usually my problem, not the info on GEO.

If you have a bunch of transistors to match, and you've built the test jig, read the article again. And maybe again...

[PerroGrande]

Dave's example is correct if you're using the setup as outlined on GEO. 

Of course, the more accurate your resistors, the more accurate the results. 

[Zben3129]

Thanks

Just wanted some general figures

Merry Christmas

Zach