Regulate the psu of a power opamp with a similar power opamp?

[moamps]

Originally posted by tschrama

Something like this? [/B]

Hi,

PS rails are too high, IMO.
Also, using tracking PS voltage (C4,C5) isn't good idea, IMO.

Regards
Milan

[tschrama]

Take a good look MOAMPS... voltages are within specs and stay within specs due to the voltage rail tracking... I'm not saying this is a practicle schematyic.. but you get the idea...

[moamps]

Originally posted by tschrama
I'm not saying this is a practicle schematyic..

Ok,

Then,... tracking isn't correct. For input +3,5V peak, output is on 77V but +rail is in this moment on only 75; PS is too high . Or U1 and U3 need higher gain.

And, this amp produce theoreticaly 75Vp on output; 350W/8ohm; a lot of power.

Regards
Milan

[jarkaa]

Here is a nice transistor boosted gainclone psu.

http://koti.mbnet.fi/jahonen/Audio/DIY/GCRegPower/

[alexw88]

Looks good, has anyone tried that?

if comparing :
1. LM317 boosted by transistor
2. just use LT1083

What would be better? Provided that the current I need is about 7A.