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Old 8th November 2006, 01:32 PM   #1
robertc is offline robertc  Malaysia
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Default 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.
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Old 8th November 2006, 02:19 PM   #2
kmtang is offline kmtang  Canada
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Surely, it will work with single diode. It might just give you higher ripple but lower in frequency.

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Old 8th November 2006, 02:20 PM   #3
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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.

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Old 8th November 2006, 05:16 PM   #4
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Shoog

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

Erik
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Old 8th November 2006, 07:35 PM   #5
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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
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Old 8th November 2006, 10:17 PM   #6
robertc is offline robertc  Malaysia
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thanks Shoog
so i batter go to bridge rectifier . right?
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Old 8th November 2006, 10:26 PM   #7
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Sonic advantages may be obtained because of saturation of biased core rectified voltage will be a bit regulated.
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Old 9th November 2006, 07:43 AM   #8
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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
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Old 9th November 2006, 08:26 AM   #9
EC8010 is offline EC8010  United Kingdom
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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?
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