Reliable B+ PSU for pro preamp

rotation · 29th November 2007, 06:51 PM

Hi!

I need to design a good PSU for mic preamp.
B+ and heaters need to be regulated because that makes part of the sound.
PSU needs some kind of protection if any of it's components fail. This is very important.
It has to be based on SS devices because of small chasis.
I don't want fancy components or designs. I'm buying from Farnell.

B+ needs to be 290VDC/20-25mA.
Heaters need 6,3V/600-1000mA

Let me tell you about the circuit; it's based on EF86 input tube and E88CC output. There is 1:7 input and 7:1 output transformer.
I used good material like Solen caps for coupling, silver mica for the filters, big film caps for decoupling, transformers are Cinemag and so on.

So, what would you suggest me? I'm ok about heater, i take 317 and i'm done. I would like to have opinions about B+.

So far i found these circuits:

http://members.nuvox.net/~zt.robgrow...wersupply.html http://img150.imageshack.us/my.php?i...suschemiw8.jpg

Thanks!

Miha

astouffer · 30th November 2007, 03:14 AM

See this link http://www.diyaudio.com/forums/showt...79#post1361779

For the heaters you could use an L200C regulator or 7806 with a schottky diode in the gnd leg to float .3 volts.

29th November 2007, 06:51 PM	#1
rotation diyAudio Member Join Date: Oct 2005	Reliable B+ PSU for pro preamp Hi! I need to design a good PSU for mic preamp. B+ and heaters need to be regulated because that makes part of the sound. PSU needs some kind of protection if any of it's components fail. This is very important. It has to be based on SS devices because of small chasis. I don't want fancy components or designs. I'm buying from Farnell. B+ needs to be 290VDC/20-25mA. Heaters need 6,3V/600-1000mA Let me tell you about the circuit; it's based on EF86 input tube and E88CC output. There is 1:7 input and 7:1 output transformer. I used good material like Solen caps for coupling, silver mica for the filters, big film caps for decoupling, transformers are Cinemag and so on. So, what would you suggest me? I'm ok about heater, i take 317 and i'm done. I would like to have opinions about B+. So far i found these circuits: http://members.nuvox.net/~zt.robgrow...wersupply.html http://img150.imageshack.us/my.php?i...suschemiw8.jpg Thanks! Miha

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30th November 2007, 03:14 AM	#2
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	See this link http://www.diyaudio.com/forums/showt...79#post1361779 For the heaters you could use an L200C regulator or 7806 with a schottky diode in the gnd leg to float .3 volts.