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Old 28th September 2007, 11:09 AM   #1
diyAudio Member
Join Date: May 2005
Default Aleph 30 power supply

I built an Aleph 30 and it works ok. The power supply as a 300 watt torroid 2x18v (ac). I should have about 25V after the rectifier bridge, however, when measured with the multimeter I get 17 v (ac) and only 20,5 V (DC). The current is 5Amp and have 6 capacitors of 15000 uF

Is it normal to get nearly 3,5 volts across the rectifiers (datasheet says 1,2V)? What could be wrong?
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Old 28th September 2007, 02:41 PM   #2
traw is offline traw  United States
diyAudio Member
Join Date: Sep 2005
Putting a beating on the transformer 5 amps of 8 (300va /36) so will sag 10-15%. I bet that transformer will get mighty warm.

Any losses across CRC?

I used 500va, 20x2 on aleph30.

Rule of thumb is 1.2 rather than 1.41 in these heavy current loads.
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Old 28th September 2007, 04:47 PM   #3
diyAudio Member
Join Date: May 2005
Thanks for your reply
You must be right, i have to change the torroid. It gets fairly warm, nothing to worry about but +- rails are on the short side, only +-21V
Across CRC, only 0,5V ... i use a 0,1 ohm resistor.

Well, another transformer for a chipamp iím working on
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