[sdiy] 904A adjustments

Michael Buchstaller buchi at takeonetech.de
Fri Mar 14 19:59:28 CET 2003


Hi Keith & List,

>Now on my module with R40 fully counter clockwise
>the closest I can get is R35 = 0.365V and R39 = 1.468V
>I have checked all the components and wireing.

When trying to balance this out, i had problems too.
But after triple- and 4-times checking my board layout, i found
a mistake i made. Corrected it, and then i managed to
converge the voltages at approx. 1.1 Volts - should be close enough.

>The transistors are all matched to 0.001V of each
>other so I suppose I needn't worry?

My transistors are matched to 2 mV with Moog´s suggested
circuit. But i also matched the resistors - Maybe that could be
important.


-Michael Buchstaller



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