single Diode power supply?

robertc · 8th November 2006, 01:32 PM

do you think a single diode power supply for my clone m7 preamp work properly? i ask just because i heard that marantz model 7 with single work perfectly and ever the reissue m7 still with half ware power supply.

kmtang · 8th November 2006, 02:19 PM

Surely, it will work with single diode. It might just give you higher ripple but lower in frequency.

Johnny

Shoog · 8th November 2006, 02:20 PM

I am using a single diode supply for my phono preamp. Works fine without issues. Because the supply is only charged half as often as a bridge rectifier it will charge more strongly and hence have bigger charging spikes. Expect to need slightly more capacitance in your power supply. I snubber my diode with a small cap.

Shoog

ErikdeBest · 8th November 2006, 05:16 PM

Shoog

Do you have any special reason to use single diode supply? I mean, soundwise... or just saving some pennies?

Erik

Shoog · 8th November 2006, 07:35 PM

No special reason, it was just the transformer I had. Valve transformers are not easy to get hold of where I am so I have to use what comes to hand.
I will replace it as soon as I can, because it physically hums more than the circuit at the moment - which is no good at all.
Shoog

robertc · 8th November 2006, 10:17 PM

thanks Shoog
so i batter go to bridge rectifier . right?

Wavebourn · 8th November 2006, 10:26 PM

Sonic advantages may be obtained because of saturation of biased core rectified voltage will be a bit regulated.

Shoog · 9th November 2006, 07:43 AM

I wouldn't disregard the single diode option if thats the transformer you have got. Mine physically hums because its an old poor design - not because of the single winding as such. My transformer is quiet without the case lid on, but when the lid goes on then the hum starts. It seems to be an effect of the transformer magnetically pushing and pulling the lid of the case, turning it into a large diaphram.
Sonically I would guess that, with the correct power supply, there shouldn't be anything between a single diode and a bridge.

Shoog

EC8010 · 9th November 2006, 08:26 AM

Quote:

Originally posted by Wavebourn
Sonic advantages may be obtained because of saturation of biased core rectified voltage will be a bit regulated.

I don't see that at all. Half wave rectification means we draw DC from the transformer, but that DC is proportional to the load current, so how can it help with regulation?

8th November 2006, 01:32 PM	#1
robertc diyAudio Member Join Date: Dec 2004 Location: my	single Diode power supply? do you think a single diode power supply for my clone m7 preamp work properly? i ask just because i heard that marantz model 7 with single work perfectly and ever the reissue m7 still with half ware power supply.

8th November 2006, 10:26 PM	#7
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Sonic advantages may be obtained because of saturation of biased core rectified voltage will be a bit regulated. __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

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8th November 2006, 02:19 PM	#2
kmtang diyAudio Member Join Date: Nov 2004 Location: Vancouver	Surely, it will work with single diode. It might just give you higher ripple but lower in frequency. Johnny

8th November 2006, 02:20 PM	#3
Shoog diyAudio Member Join Date: Aug 2002 Location: Eire	I am using a single diode supply for my phono preamp. Works fine without issues. Because the supply is only charged half as often as a bridge rectifier it will charge more strongly and hence have bigger charging spikes. Expect to need slightly more capacitance in your power supply. I snubber my diode with a small cap. Shoog

8th November 2006, 05:16 PM	#4
ErikdeBest mostly thinkerer diyAudio Member Join Date: Mar 2003 Location: Maputo - Mozambique	Shoog Do you have any special reason to use single diode supply? I mean, soundwise... or just saving some pennies? Erik

8th November 2006, 07:35 PM	#5
Shoog diyAudio Member Join Date: Aug 2002 Location: Eire	No special reason, it was just the transformer I had. Valve transformers are not easy to get hold of where I am so I have to use what comes to hand. I will replace it as soon as I can, because it physically hums more than the circuit at the moment - which is no good at all. Shoog

8th November 2006, 10:17 PM	#6
robertc diyAudio Member Join Date: Dec 2004 Location: my	thanks Shoog so i batter go to bridge rectifier . right?

9th November 2006, 07:43 AM	#8
Shoog diyAudio Member Join Date: Aug 2002 Location: Eire	I wouldn't disregard the single diode option if thats the transformer you have got. Mine physically hums because its an old poor design - not because of the single winding as such. My transformer is quiet without the case lid on, but when the lid goes on then the hum starts. It seems to be an effect of the transformer magnetically pushing and pulling the lid of the case, turning it into a large diaphram. Sonically I would guess that, with the correct power supply, there shouldn't be anything between a single diode and a bridge. Shoog