1176 edits

Hey

Gonna breadbrd a simpler psu for a dual1176 with components i have already, is the components I've marked on the attached image okay for chop? and is where i'll be feeding the 30v and -10v all good? Finally, just to clear up confusion on the meter switch, is pos 1 correct?

Thanks!

Gonna breadbrd a simpler psu for a dual1176 with components i have already, is the components I've marked on the attached image okay for chop? and is where i'll be feeding the 30v and -10v all good? Finally, just to clear up confusion on the meter switch, is pos 1 correct?

Click to expand...

Chop looks ok to me...feed points look good: -10V between R45 and R82, +30 feeds the collector of Q15. Share your PSU schematic?

Do you mean is that postion 1 you've marked or is the meter switch PCB itself correctly layed out?

Chop looks ok to me...feed points look good: -10V between R45 and R82, +30 feeds the collector of Q15. Share your PSU schematic?

Click to expand...

http://notapplicable.co.uk/audiolab/1176/1176-psu.jpg

Its just a basic adjustable 0-30+/-V LM317/337 ckt - that coo?

Do you mean is that postion 1 you've marked or is the meter switch PCB itself correctly layed out?

Click to expand...

yes, is that pos 1?

cheers

http://notapplicable.co.uk/audiolab/1176/1176-psu.jpg

Its just a basic adjustable 0-30+/-V LM317/337 ckt - that coo?

Click to expand...

Looks coo to me!

yes, is that pos 1?

Click to expand...

In the full anti-clockwise position your marked point 1 would connect with pole A of the rotary. This appears to ground the input of the gain reduction control amp at point 22 on the schematic, making it the G.R. Disable setting.

Are you sure that the 317 will handle the current drawof 2 boards? The 7824 that is on the original supply gets quite hot & has the same current rating as a 317!