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-   -   A-class Preamp PSU (http://www.diyaudio.com/forums/power-supplies/164365-class-preamp-psu.html)

apexaudio 2nd April 2010 04:44 PM

A-class Preamp PSU
 
1 Attachment(s)
This PSU I use for SS Preamp. Output voltage +/-24Vmax.

apexaudio 2nd April 2010 05:49 PM

BD241 and BD242 must placed on heatsink. With 1k output voltage can be adjust. This PSU significantly reduced TIM distortion of preamp, and have low HF impedance.

apexaudio 2nd April 2010 11:04 PM

Shunt regulator on this circuit is from 1989, in this time was called A class PSU.

apexaudio 3rd April 2010 09:30 AM

Pre-amp
 
1 Attachment(s)
This is circuit of preamp used with A-class PSU.

jam 3rd April 2010 01:19 PM

Good looking design Apex.

Jam

Gordy 3rd April 2010 02:27 PM

I've just started to learn about shunt regulators and seeing designs like this helps me along my path of understanding. Thank you for posting apexaudio.

apexaudio 3rd April 2010 03:59 PM

Fets on preamp circuit are K170 and J74, sorry for mistake.

apexaudio 5th April 2010 12:20 PM

Quote:

Originally Posted by jam (Post 2141187)
Good looking design Apex.

Jam

Thank U, is simple for understanding, and many upgrades are possible
Regards

apexaudio 5th April 2010 12:22 PM

Quote:

Originally Posted by Gordy (Post 2141226)
I've just started to learn about shunt regulators and seeing designs like this helps me along my path of understanding. Thank you for posting apexaudio.

Start with zener diode, is also shunt (parallel) regulator.
Regards

Holger Barske 5th April 2010 12:23 PM

Really like that shunt reg design. But isn't 24V secondaries a little tight if you want 24v output?


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