My First Power Supply

popilin · 12:56 AM

Hello
Here is a PSU for Valve Amplifiers, 12V<+B<600V
Choose R204 to flow about 5mA through the LM385 2.5 (Common Zenner are very noissy) R206,R207,R208 to flow 5mA through the opto coupler and have 5V at pin 1, R209,R210,P201 to flow 1mA
The time constant R204*C207 (Aprox 10s) is made smaller than filament delay (Aprox 30s) this acts as a soft start
Output Voltage is given by

+B = Vreff * ( P201+R209+R210 ) / P201

For TL431 Vreff = 2.5V

The second circuit is a time delay for heating the Valves Before +B is applied
Cheers

dady · 18th March 2012, 06:46 PM

Capo contribuyente a la ciencia internacional, es mi amigo Popilín de Bachín.
Head and Braininess Friend of the international science. This is my Friend Popilin of bachín. Congratulations for that electronic circuit diagram.

popilin · 18th March 2012, 08:05 PM

Hi dady
Thank you for your comments, I do not deserve.
As a little advice try 2SK2671 instead of IRFBC40 and you can work until 900V at the input cap.
Best regards from Argentina

18th March 2012, 06:46 PM	#2
dady diyAudio Member Join Date: Oct 2002 Location: Punta Prima, Menorca, Spain	Capo contribuyente a la ciencia internacional, es mi amigo Popilín de Bachín. Head and Braininess Friend of the international science. This is my Friend Popilin of bachín. Congratulations for that electronic circuit diagram. __________________ Esteban Bikic

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18th March 2012, 08:05 PM	#3
popilin diyAudio Member Join Date: Oct 2010 Location: Traslasierra	Hi dady Thank you for your comments, I do not deserve. As a little advice try 2SK2671 instead of IRFBC40 and you can work until 900V at the input cap. Best regards from Argentina