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High power diodes any good?
High power diodes any good?
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Old 14th March 2019, 03:57 AM   #11
wg_ski is offline wg_ski  United States
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Quote:
Originally Posted by mchambin View Post
You want high power diodes.
You have 6 of them in your car alternator ( 3 negative and 3 positive) . They are perfectly good for audio in a power supply.
.
The diodes in a car alternator might only be a 50 or 100 volt rating. 100 amps maybe, but it is a 14.4 volt system and lower voltage rated diodes in any given series have lower forward voltage drop. At 14 volts every tenth counts, So there is some justification to use the lowest voltage possible in the alternator.

But perfect for running an LM3886 off a 1kVA toroid (which is what you need if you want 3% regulation).
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Old 14th March 2019, 06:03 AM   #12
johnego is offline johnego  Indonesia
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Quote:
Originally Posted by Bensen View Post
Standard I'm using hfa25pb60 fast soft recovery diodes.

The diodes from datasheet below are mentioning the same. Would these be any good for class AB amp's? Any reason why not to use them?

https://www.promelec.ru/pdf/UFB200FA20P.pdf

That one is up to your standard. But my standard is higher . In general (tho it depends on brand and model), smaller diodes (current rating) have better specifications for audio than its bigger siblings (Some Japanese products used axial diodes with heatsink). And we can even increase the performance further by lowering the current going through them by using dual bridge with dual secondaries.
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Old 14th March 2019, 09:25 AM   #13
trobbins is offline trobbins  Australia
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Benson has only described his application as class AB - that could be a 100mW headphone amplifier, or a huge stadium amplifier. I'd second guess its more likely a 100mW amp, as many people seem to think that 25A rated diodes must be better, especially if their 600V rating is similarly better for a 40V application, and if they cost orders of magnitude more than any mundane diode found in most amps.

I just hope they come with a sticker to apply to the front of the amp - so you don't forget you put something extra special in - that would be a reason to use them (as opposed to a reason not to use them, which I think was the original query).
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Old 14th March 2019, 06:29 PM   #14
Bensen is offline Bensen  Belgium
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Quote:
Originally Posted by johnego View Post
That one is up to your standard. But my standard is higher . In general (tho it depends on brand and model), smaller diodes (current rating) have better specifications for audio than its bigger siblings (Some Japanese products used axial diodes with heatsink). And we can even increase the performance further by lowering the current going through them by using dual bridge with dual secondaries.
Thanks for the feedback.

The diodes are used in a dual bridge configuration with a dual secondaries 1kva 2x36Vac toroid. Load is 2x22000uf 63v low ESR vishay caps /rail, with screw connections for a class Ab power amp which can deliver 12Wrms into 8ohm classe A.
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