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Old 7th July 2003, 07:14 PM   #1
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Default i can't believe this works (baby's first gainclone?)

i didn't put a volume pot on it cos i thought, hey i can just control the volume with the computer, but the computer volume is on zero right now and the instant message sound clips. i need some attenuation yo. it hums a little bit too, just a little, but i don't even mind. i will build a really nice one next time. please don't make fun of my spring loaded speaker terminals or my mess of a ground point.

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Old 7th July 2003, 08:37 PM   #2
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Great Job on your first effort and there is nothing wrong with your grounding scheme

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Old 7th July 2003, 10:11 PM   #3
Netlist is offline Netlist  Belgium
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Your picture reveals this is not your first attempt.
'B' in the left hand corner.
You can certainly be very proud of your amp.
Nice placement of the components.
Maybe turning the trafo a bit could shorten your PSU wires.
I know nothing about gainclones but maybe this could also help reduce hum a bit.

Hugo
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Old 7th July 2003, 10:29 PM   #4
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wow. thanks guys.

it only hums the 60hz hum when the inputs are plugged in?
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Old 7th July 2003, 11:07 PM   #5
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nice! mines not in a case yet i can do the electronics fine, but the casing is a problem for me. nice grounding! better than mine.
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Old 8th July 2003, 10:51 AM   #6
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Travis,

Congratulations and welcome to the club.
Just some suggestions for your nice Gainclone:

The caps on the little board are input caps, right?
Not PSU, I suppose.
If so, the PSU caps are too far.
At least put some 100~220uf PSU caps on that board, it seams to have space for that.
You have hum because your amp doesn't know the words yet (c) Mr. Feedback.
To eliminate the hum, instead of the independent ground wires you have from the board to the star ground on the case, disconnect those and put a thick and very short wire from one channel's ground point to the other, on the board.
From a mid point of that wire connect just one wire to the star ground on the case.
The same goes to the PSU caps: join the two pins on the caps (+ from one and - from the other) that make the ground and run just one wire to the star ground on the case.
With this, you'll stop the hummmmmm and you'll have two wires removed from your case star ground.
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Old 8th July 2003, 11:56 AM   #7
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(c) Mr. Feedback.
Thanks Carlos.

Eric.
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Old 8th July 2003, 12:04 PM   #8
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You have to register that, Eric.
It's a very good one.
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Old 8th July 2003, 01:09 PM   #9
Luke is offline Luke  New Zealand
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Hi Travis,

try a 10K resistor between the grounded input pin and ground. It works like magic and youll get zero hum.
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Old 8th July 2003, 01:59 PM   #10
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Nice amp! Looks good.


Quote:
Originally posted by carlosfm
You have to register that, Eric.
It's a very good one.
Sorry, but someone already beat him to it. Dan Torres uses that one in his book about building tube guitar amps.
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