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Old 28th April 2012, 07:53 PM   #7571
Salas is online now Salas  Greece
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Originally Posted by chalkandtalk View Post
Fired up today. We have music in both channels Thank you Salas.
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Old 29th April 2012, 11:07 AM   #7572
Marinos is offline Marinos  Greece
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Originally Posted by Milos P. View Post
I'm not sure. The thing is that Q1 drain on both ch. was shorting to ground
once I start tightening it to the sink. Strange that was not the case with Q4-
it stayed insulated from the sink no matter how tight it was. I know that as
my audio gnd is separated from the safety gnd by 10R-2W II 100n NPO.
My meter showed 0ohm Q1 (tightend to sink) to chassis and ~10ohm Q4 to chassis.

I have some graphite to240 pads. I purchased them (years ago) because of their astoningshly low thermal resistance.
Unfortunaly they are conductive. It was written on the specs..
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Old 29th April 2012, 01:59 PM   #7573
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http://search.digikey.com/scripts/Dk...1-ND&x=10&y=18

are the ones. I was lazy to check the data sheet so I paid the price
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Old 2nd May 2012, 04:22 PM   #7574
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I am so surprised how good my 12.50 Technics deck sounds. Salas, your circuit is working great. The music dept, at work is chucking out a pile of classical vinyl, which I have just inherited.

I still have a slight problem with hum. However, it seems that there are quite a few causes of it besides earth loops. I thought I would need to rehouse my RIAA circuit, but maybe not.
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Old 2nd May 2012, 06:01 PM   #7575
Salas is online now Salas  Greece
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Show some pics, maybe we can help you with routing and boxing ideas. It's been done silent many times before, there should be a better config.
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Old 2nd May 2012, 08:00 PM   #7576
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That's great. I'll try to get some pics up this weekend.
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Old 2nd May 2012, 08:05 PM   #7577
Salas is online now Salas  Greece
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Do you use coax signal cable? Is a question until you show pics. If not, try that.
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Old 3rd May 2012, 08:41 PM   #7578
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Originally Posted by Salas View Post
Do you use coax signal cable? Is a question until you show pics. If not, try that.
I installed screened cable today. I also re-routed the power cables away from the RIAA.

RESULT - hum gone

Good tip, thanks Salas.

I'll still post pics this weekend.
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Old 3rd May 2012, 09:51 PM   #7579
Salas is online now Salas  Greece
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Thumbs up. Niiiice....

The Fast Show - Jazz Club (Piles Husain) - YouTube
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Old 5th May 2012, 01:39 PM   #7580
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Here's my circuit.

Click the image to open in full size.

Initially the power input was in-between the audio in and out. This meant that power had to cross one of the boards, which contributed to the hum. Power now comes in from the middle of the base.
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