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Old 10th November 2009, 11:20 PM   #13491
poynton is offline poynton  United Kingdom
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What's it say below ??
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Old 11th November 2009, 06:58 AM   #13492
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It's alive! .... Alive!

At least when using the old regs. After I discovered it's still alive, I put in the lm317/337 and alas, that didn't work (disc spins, just no sound at all, no errors)...

Output voltages of the lm317/377 were 11.9V and 10,9V (which is a bit odd, but could be measurement error due to my testing setup).
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Old 11th November 2009, 07:15 AM   #13493
UV101 is offline UV101  England
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The only rails that those regs are supplying are the +/-12v to the HDAM and opamps (thats why everything else will work but you're getting no sound).

I would run 3 wires Make sure you have the pin config correct for the - reg

See Audio Upgrades - Voltage Regulators. The pin out is half way down the page.
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Old 11th November 2009, 08:00 AM   #13494
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3 wires, what do you mean? I used 3 wires for testing as you said.
Connected Vin and Ground to the Reg, and Vout and Ground to the multimeter.


Very likely I busted the PCB traces and metal around the holes since I soldered and desoldered a couple of times (desoldering the old ones,testing new ones, putting back old ones to see if the machine still works, desoldering, putting in the new ones etc etc). So I will probably need to hard-wire the broken connections to the next point (e.g. Vin to the Vout of the nearest elco)

Last edited by studiostevus; 11th November 2009 at 08:26 AM.
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Old 11th November 2009, 10:10 AM   #13495
6h5c is offline 6h5c  Netherlands
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It's possible the regulator doesn't work correctly when you test it on the bench without any load. Try connecting a small cap (10...47u) between the reg's output and ground, and make sure the minimum load current is 10mA. This can be met by placing a 1k resistor across the cap.

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Ray
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Old 11th November 2009, 10:45 AM   #13496
UV101 is offline UV101  England
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Quote:
Originally Posted by UV101 View Post
I would run 3 wires
Sorry didn't mean to include that in the post!!!!!
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Old 11th November 2009, 11:57 AM   #13497
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By the way, I used a 220uF/16V cap on both regulators. I assume this will not be a bottleneck, will it?
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Old 11th November 2009, 12:04 PM   #13498
SimontY is offline SimontY  United Kingdom
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That sounds sensible to me. A cap on the input and output of each regulator is usually seen as a positive thing.

Simon
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Old 11th November 2009, 01:27 PM   #13499
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Quote:
Originally Posted by 6h5c View Post
Thanks, it looks so much cooler than a home-made PCB, with solder mask and silk screen
I'm thinking about rebuilding the one in my SA8400

Finally this forum accepts larger image sizes
Ray,
Those boards look really nice.
However, the lack of having one last year made me learn how to design one, and taught me a new skill.
But with you now having those nice boards more people can easily make up a DOS, which everyone should have in their players!
The DOS is still the single biggest improvement I have ever made in audio.

Steve
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Old 11th November 2009, 01:46 PM   #13500
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Those pcbs look very nice Ray

Brent
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