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Chip Amps Amplifiers based on integrated circuits

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Old 11th June 2003, 03:33 PM   #21
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Quote:
Originally posted by elizard
actually i'll go try the star earths now

also the buzzing is the same at any position of the volume control
Ok.
You can do this very simple test:
With the two cases side by side, connect a short wire (the shortest possible, cut to length) from one star ground to the other (that is, the ground point of the two PSU caps in each channel).
Now turn it on.
Less noise?
Yes!
If they were in the same box, you could get the two channels even closer.
Take a look at the pictures in my "PC Gainclone" thread and you'll see what I mean.
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Old 11th June 2003, 03:50 PM   #22
elizard is offline elizard  Canada
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that's what i tried, with a wire about 3" at most in length (as close as i could get em), no difference .. the slight hum is still there
as i said, not affected by volume level, and not audible if you're more than 5-6" away from the speaker
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Old 11th June 2003, 04:34 PM   #23
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3" is still too much.
Oh, well... with separate boxes you can't do better...
I like to do a circuit on breadboard.
Against what most people believe, I manage to make a more compact design than point-to-point.
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Old 11th June 2003, 05:19 PM   #24
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nice work but (stupid question): why didn't you put the amps inside the "public" box, it seems to be large and suitable for that???
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Old 11th June 2003, 05:22 PM   #25
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i was debating it, and still may do it .. the main reason however was that i wanted to keep the power and the amps separate

when i get some time, i may however move everything to the public amp box .. maybe even make the thing integrated (although i kinda doubt that, until at least i get another amp goin)
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Old 11th June 2003, 05:47 PM   #26
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This may be a good idea after all, as the umbilical cord from PS to the amp has big influence on the sound. Recently I found out that Cardas is better than Kimber wire, I was using before (more depth in the soundstage)
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Old 11th June 2003, 05:51 PM   #27
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Well, the question is whether the effect cables have is more negative than the effect of having both the PS and the 2 channels with the PS.
I'll say it is, at least with the toroids, since the plitron ones seem to be built very well. I hear no buzzing, slight bit on turn on. It also doesn't get warm at all (well barely!).

It is something I'll definitely try, maybe even tonight
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Old 11th June 2003, 05:55 PM   #28
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If I decide to mount them all in the one case, do you guys think just mounting the chips to the bottom of the case will be sufficient for the cooling??? or should I leave them on the tiny heatsinks?
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Old 11th June 2003, 08:32 PM   #29
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Quote:
Originally posted by elizard
If I decide to mount them all in the one case, do you guys think just mounting the chips to the bottom of the case will be sufficient for the cooling??? or should I leave them on the tiny heatsinks?

i speak from practically no knowledge, but i think it should be fine. my gainclone ran fine with the chips in mid-air hanging by the leads. now they are on heatsinks that are about 8cm (3") by 3cm (1") with fins about 5mm (1/4")long and they dont even get warm. (both chips on the same heatsink)
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Old 11th June 2003, 11:41 PM   #30
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you MUST change the heatsinks if you want to run the amps at higher levels (the ones you have are suited for 5-10W chips)
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