F5 Bias Problem

[AudioSan]

thanks ZM i think i have some 1nF around here somewhere
EDIT: no i did not. only 22nF

 

[Zen Mod]

you can put 22 of them in series



(or you can dismantle anything broken in your house , and find any cap between 680p and 3n3)

 

[AudioSan]

hehehehe thats no good. i have only 3
i can have a look on a amp board i have here. but i think there are only 1uF and 4.7uF.
i found i found 2.2nF 2 in parallel.

 

[AudioSan]

then, the little gizmo is build and the housing is a little old antenna amp

 

[Zen Mod]

for ~1nF - it's wiser to put 2 x 2n2 in series ........ than in parallel

 

[AudioSan]

okei. well. thats an easy fiks
EDIT: done

 

[IZHAKKATZ]

the common bias problem

Hi all

I'm also having the common bias problem:
I can get max 0.4V with 0 offset above that bias offset goes up.
All i have around are 4.75K resistors to change R3 & 4 ( from 2.2k)is that okay or is 4.75 too much resistance ? I would like to resolder resistors only once and get it right this time

Thank you everyone
ik

 

[Zen Mod]

4K75 are good

 

[AudioSan]

4.75 is fine. just turn the pot all the way back before you fire it up

 

[AudioSan]

ZM you got me with a sec or 10

 

[IZHAKKATZ]

Thank you guys