Sjöström Audio DIY forum

Projects => Power supplies => Topic started by: peranders on June 24, 2013, 09:17:19 PM

Title: SSR02 only 8.3 volt out
Post by: peranders on June 24, 2013, 09:17:19 PM
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?
Title: Re: SSR02 only 8.3 volt out
Post by: VesaK on June 24, 2013, 10:00:36 PM
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
Title: Re: SSR02 only 8.3 volt out
Post by: peranders on June 24, 2013, 10:16:28 PM
Oops, too late to push "Post".
Title: Re: SSR02 only 8.3 volt out
Post by: fbee on June 30, 2013, 09:23:41 PM
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
Title: Re: SSR02 only 8.3 volt out
Post by: peranders on June 30, 2013, 09:51:14 PM
The LM329 should be mounted exactly as the thin outline of the VR1. Please check the assembly drawing for the SSR02.
Title: Re: SSR02 only 8.3 volt out
Post by: fbee on June 30, 2013, 10:26:27 PM
Thanks
thats it
Frank