SSR02 only 8.3 volt out

[peranders]

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?

[VesaK]

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

[peranders]

Oops, too late to push "Post".

[fbee]

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

[peranders]

The LM329 should be mounted exactly as the thin outline of the VR1. Please check the assembly drawing for the SSR02.

[fbee]

Thanks
thats it
Frank