Re: Yocto (work in progres) noise 130mV jumping up and down
Posted: Mar 10th, '16, 22:53
Im using Ac mode mV multimetr is tru Rms is jumping after i instal 10uf 35v and change the R131
Hello everybody,
I have a problem with the noise section, I make the modifcation we see in the service manual page 15 (R131=100K, R129=jumper, R130= 1M+22p, R127=10uF 25V). I have a fluctuate result between 0V and 22mV or -22mV and the modification of TM4 change anything. When I make the original mounting, I have 130mV with TM4 turn max on the right (max on the left I have 1,2V).
I change IC with other 4558, LF353P, OPA2134 and it changes anything, I test the SC828 with a hFE tester and my result 239.
Ihave the -15V and the +15V at the right place.
If you have some advice it would be cool.
i must make same calibration and check all the functions but the sound is amazing 
,i'm beginner so this project is big thing for me and is excellent projekt
fat 808 kick