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Chip Amps Amplifiers based on integrated circuits

LM3875 Kit Finished - Could use some more bass
LM3875 Kit Finished - Could use some more bass
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Old 31st March 2008, 12:45 PM   #91
CarlosT is offline CarlosT  United States
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Panasonic FCs are fine caps and yes...conditioning (or break-in) is important). I went with slightly better FM series which at 50v are only offered up to 1,000 uF. No problem here. With an unregulated PSU design, there's no free lunch...can't go stuffing huge caps. If you need to really thump away, better go back and find a good regulated PSU and put some serious rails of big caps. I think that was Carlos' eventual epiphany...NEED A REGULATED PSU and leave the amp board alone...

If I remember right one of Peter Daniel's favorite GCs runs on premium Blackgates of just 100 uF...
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Old 31st March 2008, 01:13 PM   #92
Dxvideo is offline Dxvideo  Turkey
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A regulated example with turn on delay circuit..
Based on CarlosFM s reference design with LM338s.. But no snubbers on board.
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Firstly I was thinking to use 1,500uF/35v Panasonic FMs as first reservoirs. They have 2750mA ripple handle capacity. However by the time I've decided to put 10,000u because its more safe I guess..
Anyway, I think this circuit will enough for a stereo LM3875 gc with 28-30v...
Do you have any advice?
Best regards,
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