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A-class Preamp PSU
A-class Preamp PSU
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Old 2nd April 2010, 04:44 PM   #1
apexaudio is offline apexaudio  Serbia
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Default A-class Preamp PSU

This PSU I use for SS Preamp. Output voltage +/-24Vmax.
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File Type: jpg APEX 2x24V Aclass PSU.jpg (417.5 KB, 15241 views)
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Old 2nd April 2010, 05:49 PM   #2
apexaudio is offline apexaudio  Serbia
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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.

Last edited by apexaudio; 2nd April 2010 at 05:52 PM.
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Old 2nd April 2010, 11:04 PM   #3
apexaudio is offline apexaudio  Serbia
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Shunt regulator on this circuit is from 1989, in this time was called A class PSU.
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Old 3rd April 2010, 09:30 AM   #4
apexaudio is offline apexaudio  Serbia
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Default Pre-amp

This is circuit of preamp used with A-class PSU.
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File Type: jpg APEX FET PREAMP.jpg (411.5 KB, 6209 views)
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Old 3rd April 2010, 01:19 PM   #5
jam is offline jam  United States
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Good looking design Apex.

Jam

Last edited by jam; 3rd April 2010 at 01:20 PM. Reason: typo
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Old 3rd April 2010, 02:27 PM   #6
Gordy is offline Gordy  United Kingdom
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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.
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Old 3rd April 2010, 03:59 PM   #7
apexaudio is offline apexaudio  Serbia
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Fets on preamp circuit are K170 and J74, sorry for mistake.
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Old 5th April 2010, 12:20 PM   #8
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by jam View Post
Good looking design Apex.

Jam
Thank U, is simple for understanding, and many upgrades are possible
Regards
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Old 5th April 2010, 12:22 PM   #9
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by Gordy View Post
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.
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Old 5th April 2010, 12:23 PM   #10
Holger Barske is offline Holger Barske  Germany
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Really like that shunt reg design. But isn't 24V secondaries a little tight if you want 24v output?
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