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Chip Amps Amplifiers based on integrated circuits

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Old 16th August 2009, 08:30 AM   #11
PJPro is offline PJPro  England
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Originally posted by Stuey
Cheers Tony.

PJ, here's a pretty good PDF about ground loops etc. if you have the time to read it!



That's one long article . But a useful resource. Thanks Stuey.
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Old 16th August 2009, 08:36 AM   #12
PJPro is offline PJPro  England
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Originally posted by pacificblue

Not you, but maybe the amplifier.
OK. I'll reposition the RF filter to the other side of the relay.
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Old 16th August 2009, 12:47 PM   #13
wintermute is offline wintermute  Australia
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Hi PJ,

OK if it is for safety reasons (with respect to not running it off the main transformer) , then provided the switch transformer had enough grunt to run the additional circuit (I note it is only 1.5VA) then I would say it would be ok to piggyback off that (again assuming that there is some sort of regulation on the circuit or that it can run over a range of voltages). Probably best to pose the question on the ESP forums If you can save one transformer it is probably worth it... They can be noisy, not to mention the extra $$$.

I did note the discussions around safetfy ground on your main thread (I assume this is why Stuey has posted the earth loop article) . I can't remember the handle of the person wanting to earth the rca's to the chassis, but I can definitely say from experience that this will almost certainly result in very loud hum! My first DIY amp which I made in 1984 had this problem. The hum was so loud that I had trouble hearing the music

I ended up implementing the earth loop breaker which Rod Elliot suggests on his site for my Gainclone. The reason was that I was hooking it up to my PC, and it hummed with just standard safety earth connection (most HI-FI components (at least in aus) don't have 3 pin power plugs, so earth loops generally aren't a problem, but a PC does have a three pin plug, and so does an amp. With the earth loop breaker it is dead silent

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