matchbox build help

Started by changes, November 21, 2004, 06:18:01 PM

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changes

i've breadboarded it
used a 2n7000 at the input stage
well when i had the led as in the schem the mosfet drain was at 7.9V and almost no sound at all or something like a misbiased fet.when i reversed the led then drain voltage was 4.5 and i was getting sound...
can some explain it???
have i done somethin wrong?
CHANGES

RDV


RDV

2N7000 pinout is reversed from BS170.

Looking at face:

BS170 = DGS
2N7000 = SGD

HTH

RDV

changes

no i think not i checked twice

edit:
well this is a funny one...
i had the led pins pre cut so i took the - pin for the + and vice versa... :lol:
CHANGES