testing Ge-npn's (and pnp's)

Started by mat, December 13, 2005, 04:32:12 PM

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jpm83

Quote from: mat on December 15, 2005, 07:47:21 AM
Quote from: jpm83 on December 14, 2005, 03:52:02 PM
Quote from: bioroids on December 14, 2005, 02:09:00 PM
Quote from: jpm83 on December 14, 2005, 01:51:07 PM


Well me too  :icon_cool: Terve vaan !

No terve vaan sullekin :)

I would still have one question about these transistors. I tested them today so which of these I should pick the upper value is leagage and lower is amplification.

235
67

286
76

181
61

122
52

169
57

329
102

132
55

443
101

(I hope I didn´t make any mistakes in measurement)


bioroids

Oh your leakage values seem pretty high for the corresponding gain. Are those the better specimens?
Eramos tan pobres!

jpm83

Quote from: bioroids on December 15, 2005, 11:33:04 AM
Oh your leakage values seem pretty high for the corresponding gain. Are those the better specimens?


These are all I got. By the way I´m making a Fulltone 69´clone, and there those trimmer and bias pot  can I compensate those values whith these.

Thanks for ansvering

bioroids

The best thing to do is to use sockets and try different transistors, biasing with the trimmers. Then choose the one you like best. You should include a diode to stabilize the circuit for temperature changes (check this page http://www.geocities.com/SunsetStrip/Studio/2987/britface.html )

I wouldnt use the ones with more than 300mA leakage.

Luck

Miguel
Eramos tan pobres!

jpm83


It´s now ready and suonds good. I used those trasistors whitch had lowes leagage. Now I just have to make a box for it ;D.