A-class Preamp PSU

[apexaudio]

This PSU I use for SS Preamp. Output voltage +/-24Vmax.

 

[apexaudio]

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]

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

 

[apexaudio]

Pre-amp

This is circuit of preamp used with A-class PSU.

 

[jam]

Good looking design Apex.

Jam

 

[Gordy]

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]

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

 

[apexaudio]

Good looking design Apex.

Jam

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

 

[apexaudio]

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]

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

 

[apexaudio]

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

That is extreme values (2x24V max), adjusting on 2x18V is also possible.
Regards

 

[apexaudio]

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

I mean upgrades on preamp, shunt regulator no need to upgrade.

 

[apexaudio]

Maybe useing mosfets instead BJT...

 

[RSK]

Miles,
Can you post the shunt regulator pcb?

Thanks,

 

[apexaudio]

Miles,
Can you post the shunt regulator pcb?

Thanks,

I will, but I must separate circuit from preamp.
Regards

 

[apexaudio]

Heatsink

Miles,
Can you post the shunt regulator pcb?

Thanks,

Heatsink on PCB ?

 

[apexaudio]

Regulated PSU for power amplifiers. Output voltage can be set and stabilised from +/-55 to+/-90V 10Amax.

 

[apexaudio]

PCB design made by 'alex mm'

 

[apexaudio]

APEX Shunt Regulator PCB

 

[apexaudio]

PCB size: 80X77,5mm