Most compact 90V power supply

jev · 29th November 2009, 06:17 PM

Hi,

I am working on an input stage for a power amp with UCD 400 modules. The input is transformer based with two 6h30 tubes. The circuit runs on 90 Volts. All is designed and transformers are wound by Pieter Treurniet of Tribute audio.

I would like to have a dual mono power supply with one or two transformers. But I also would like to keep things compact. Tribute suggested tube rectifiers with chokes. But my guess is that is going to be big.

So my guess is diode rectified with some kind of active regulation and as compact as possible. I will try to keep the parts quality as high as possible so good diodes and good caps.

nigelwright7557 · 29th November 2009, 09:28 PM

I often use a C-R-C combination and that gives good results.

jev · 30th November 2009, 07:18 AM

That is indeed compact. I had not yet thought of this (was thinking of active regulation). Should I increase the resistance or decrease the resistor value towards the amplifier? I think it is best to increase the capacitor values towards the amplifier?

AmadeusMozart · 30th November 2009, 04:41 PM

Quote:

Originally Posted by jev

Hi,

I am working on an input stage for a power amp with UCD 400 modules. The input is transformer based with two 6h30 tubes. The circuit runs on 90 Volts. All is designed and transformers are wound by Pieter Treurniet of Tribute audio.

I would like to have a dual mono power supply with one or two transformers. But I also would like to keep things compact. Tribute suggested tube rectifiers with chokes. But my guess is that is going to be big.

So my guess is diode rectified with some kind of active regulation and as compact as possible. I will try to keep the parts quality as high as possible so good diodes and good caps.

Use a high volt mosfet regulator (IRF 740 etc) with some zener diodes to set the voltage. Gets rid of all the hum.

jev · 3rd December 2009, 12:47 PM

Hello AmadeusMozart, I did some searching but have found no schematic. Do you now one or have one?

Arnulf · 3rd December 2009, 01:14 PM

Linear regulator - Wikipedia, the free encyclopedia

Use abovementioned MOSFET in place of the bipolar transistor, R2 is the actual load (you don't put real resistor there), R1 should be somewhere in the range of 10K.

You can parallel zener diode with capacitor (a couple hundred uF) that will add "soft start" function to the regulator.

Put sufficient heatsink onto transistor tab and make sure it doesn't touch anything (tab is at drain potential -> very high voltage !!!).

29th November 2009, 06:17 PM	#1
jev diyAudio Member Join Date: Jan 2005 Location: Utrecht	Most compact 90V power supply Hi, I am working on an input stage for a power amp with UCD 400 modules. The input is transformer based with two 6h30 tubes. The circuit runs on 90 Volts. All is designed and transformers are wound by Pieter Treurniet of Tribute audio. I would like to have a dual mono power supply with one or two transformers. But I also would like to keep things compact. Tribute suggested tube rectifiers with chokes. But my guess is that is going to be big. So my guess is diode rectified with some kind of active regulation and as compact as possible. I will try to keep the parts quality as high as possible so good diodes and good caps. __________________ My site http://hifi-ish.supersized.org/

29th November 2009, 09:28 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	I often use a C-R-C combination and that gives good results. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

30th November 2009, 07:18 AM	#3
jev diyAudio Member Join Date: Jan 2005 Location: Utrecht	That is indeed compact. I had not yet thought of this (was thinking of active regulation). Should I increase the resistance or decrease the resistor value towards the amplifier? I think it is best to increase the capacitor values towards the amplifier? __________________ My site http://hifi-ish.supersized.org/

3rd December 2009, 12:47 PM	#5
jev diyAudio Member Join Date: Jan 2005 Location: Utrecht	Hello AmadeusMozart, I did some searching but have found no schematic. Do you now one or have one? __________________ My site http://hifi-ish.supersized.org/

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3rd December 2009, 01:14 PM	#6
Arnulf diyAudio Member Join Date: Feb 2009	Linear regulator - Wikipedia, the free encyclopedia Use abovementioned MOSFET in place of the bipolar transistor, R2 is the actual load (you don't put real resistor there), R1 should be somewhere in the range of 10K. You can parallel zener diode with capacitor (a couple hundred uF) that will add "soft start" function to the regulator. Put sufficient heatsink onto transistor tab and make sure it doesn't touch anything (tab is at drain potential -> very high voltage !!!).

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