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Old 19th January 2004, 12:25 AM   #31
AKSA is offline AKSA  Australia
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My pleasure, thank you for your input.

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Old 24th February 2004, 09:41 AM   #32
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Originally posted by AKSA
I built a simple jig with a current source and a differential amplifier which supplies this current to the transistor under test and sets up an appropriate base drive to the DUT to ensure a prescribed voltage across the transistor with the chosen collector current. The differential pair senses a reference voltage of half the Vcc (I use a 12V gelcel battery), and adjusts the bias on the base of the device under test (DUT) to ensure half the Vcc between collector and emitter. There is a 100R resistor in series with the base of the DUT so you can measure the voltage drop across it, giving the current through into the base by Ohms Law and thus permitting the operator to figure the beta of the DUT from beta = Ic / Ib.

I'm having a mental block, and I can't seem to visualize how it is connected. Could you or someone else draw a schematic?

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