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Old 25th May 2013, 04:57 PM   #621
jan.didden is online now jan.didden  Europe
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I believe that 36V should be possible, but I need to check.

BTW Did you read Jack Walton's comparative power supply test, measurements and listening tests, in Linear Audio?

jan
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Old 25th May 2013, 05:01 PM   #622
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That is the seed that spring the question.
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Old 25th May 2013, 05:12 PM   #623
jan.didden is online now jan.didden  Europe
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In the interest of reliability, the raw input voltage should not be higher than the total opamp allowed sypply. So for the most opamps that's 36V, but some allow 44V.
Anyway, if the raw input is 36V max, the Vout max should not be higher than (precision guess) 32V or so.
Some safety factor, limit Vraw to say 33V and Vout max to 30V.
Is that not enough for almost all applications?

jan
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Old 25th May 2013, 07:54 PM   #624
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Quote:
Originally Posted by jan.didden View Post
Jack Walton's comparative power supply test, measurements and listening tests, in Linear Audio?
I gathered, Mr Walton is a Jack of all John's.
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Old 25th May 2013, 07:57 PM   #625
buzzforb is offline buzzforb  United States
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Quote:
Originally Posted by jan.didden View Post
In the interest of reliability, the raw input voltage should not be higher than the total opamp allowed sypply. So for the most opamps that's 36V, but some allow 44V.
Anyway, if the raw input is 36V max, the Vout max should not be higher than (precision guess) 32V or so.
Some safety factor, limit Vraw to say 33V and Vout max to 30V.
Is that not enough for almost all applications?

jan
I need 36 for the phono. Oh well.
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Old 25th May 2013, 08:29 PM   #626
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I need 36 for the phono. Oh well.
One extra zener will do it
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Old 25th May 2013, 08:42 PM   #627
buzzforb is offline buzzforb  United States
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Opa627 will do 36v. What op amp were you considering? I'll try to start fiddling with schematic.
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Old 25th May 2013, 08:47 PM   #628
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I need 36 for the phono. Oh well.
Hello,

What phono stage needs 36 volts anyway ? Is it AC coupled or a tube design? SOme of the lowest noise jfets with high gm will struggle with them voltages.

Most are under +/- 24volts DC...and even that can be pushing it

Kev.

PS. You can cascode the input CCS to waste unloaded headroom or change op amps.

Last edited by Fanuc; 25th May 2013 at 08:51 PM.
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Old 25th May 2013, 09:00 PM   #629
buzzforb is offline buzzforb  United States
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Hello,

What phono stage needs 36 volts anyway ? Is it AC coupled or a tube design? SOme of the lowest noise jfets with high gm will struggle with them voltages.

Most are under +/- 24volts DC...and even that can be pushing it

Kev.

PS. You can cascode the input CCS to waste unloaded headroom or change op amps.
Salas folded simplistic.
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Old 25th May 2013, 09:17 PM   #630
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PS. You can cascode the input CCS to waste unloaded headroom or change op amps.
This should read a cascoded CCS with high gm mosfet output (or possibly pre-load the output) could be used to waste unloaded voltage headroom. I am going to dig out the original PDF and have a re-read. Make sure I am up to speed on it.

A small heatsink is advisable on top of the op amp also. You could also use very linear super-beta type transistors if it's just for a single positive rail.

Last edited by Fanuc; 25th May 2013 at 09:22 PM.
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