Monday, July 9, 2007

Minor investigations

Hi!

DAC has been playing for the whole two days now - really nice sound, but know it can be improved a lot.
I've done some measurements:

TP1 = +4.85V (R24 = 1k7)
TP2 = -5.25V (R25 = 2k0)
TP3 = +4.66V (R26 = 1k6)

I really need to "equalize" resitors.

FIL1 = 6.2V
FIL2 = 6.3V

I really need to "equalize" these also. I am thinking of using one PS for both fillaments - this will quarantee same voltage (but will require 2x higher current, which I do not like).

I_dac1 = 22.5mA
I_dac2 = 25.7mA (since TP2 > TP1, I guess)
I_receiver = 18,5mA

Currents are quite small, which is good for my batteries :)

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