Börja med att mäta inspänning, utspänning och pinne 2, 3, 4, 6 och 7 på opampen.
Opaampen mäter nu
2=2.8 V
3=2 V !
4=8,11 V
5=7,86 V
6=1.15 V
7=0 V
Vad har du för spänning över LM329 VR1?
Bingo. VR1 was fitted wrongly. Had a LM431 version picture to follow. Sorry for that...
Turned it around and now output is correct.
So it is time for the real projekt: RIAA QSX Mark III + superregs + AD797 and no buffers!
Tackar!
/VesaK
Oops, too late to push "Post".
Low voltage on this SSR02
voltage in pin of the opamp
2 : 3,1V
3: 0,8V
4: 7,3V
6: 0,7V
7 :0,2V
voltage across the voltage reference (LM329) 0,85V
Compared to SSR01 , here in SSR02 VR1 was placed 180deg turned and one position down
Ideas?
Thanks, Frank
The LM329 should be mounted exactly as the thin outline of the VR1. Please check the assembly drawing for the SSR02.
Thanks
thats it
Frank