Just added caps and snubber bit from CarlosFM design PSU - diyAudio
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Old 19th September 2005, 08:22 PM   #1
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Join Date: Jun 2005
Location: West London
Thumbs up Just added caps and snubber bit from CarlosFM design PSU

I have plucked up the courage to try making something from a diagram I made the most of the CarlosFM snubberised PSU board and have added it between the rectifier and amp on my rev 3 LM3875 kit.

I left out 1 of the 10,000 uF caps in case..

1) they exploded when I plugged it in - I bet they really do go bang too - they're pretty big...

2) they take up more space than I have spare in the case

((I actually put a bike crash helmet on to switch it all on for the first time again.... ))

Anyway, its been going for 1/2 hour and hasn't gone bang yet.

I was a bit worried because I don't have a common ground - it's a dual mono kit - I have +ve / 0 and 0 /-ve but worked out which way to put the caps (I'm new to electronics... can you tell )

The sound which was already beautifully clear and detailed seems possibly slightly fuller - the bass is punchier - the speakers I'm using aren't great for bass so the difference may be more obvious.

The biggest change is how much louder I can turn up the preamp before any distortion - it goes loud enough for the sound to be completely enveloping now - I'm well chuffed..... again.

I'm getting another set of bits to do the same for the other 2 channels tomorrow.

Thanks to CarlosFM for creating it and for making the design available

quickshift = happy bunny
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Old 23rd September 2005, 01:31 AM   #2
doggy is offline doggy  Canada
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Location: Princeton B.C.
This is what I did;

added nichicon 4700uf 50v; bypassed with sangamo .001uf axial non polar cap and snubber is .47ohm 1 watt to 100nf metal poly cap.
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Old 23rd September 2005, 01:38 AM   #3
doggy is offline doggy  Canada
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The result is: more swing,resolution, better defined bass, a much quieter background. You can hear more detail.It gets you in a little closer.

the pic shows the 2 channels, one not modified

cheers doggy
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