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Old 29th December 2012, 11:35 AM   #661
Marra is offline Marra  United Kingdom
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sq what power supply are you using?
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Old 29th December 2012, 12:17 PM   #662
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Nicer than a christmas tree:

[IMG]Click the image to open in full size.[/IMG]

Both psu and regulators are working, time to go further.

Thank you all guys for helping!

Christoph
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Old 29th December 2012, 12:20 PM   #663
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Cool, sorry i did not find the time to measure my pre regulator but you got it working anyway,
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Old 29th December 2012, 12:45 PM   #664
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Hello Joachim,

with lots of help from the friendly people of this forum!

I tried the 24v trafos but they failed powering up the regulator,
with 30v toroidals it works well.

Thank you for offering your preregulator schematic, it is (in the end)
easy to build up on a universal striped board, 10x16 cm.

Christoph
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Old 29th December 2012, 12:47 PM   #665
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Joachim, have you seen my post?

Quote:
Originally Posted by Pepperman View Post
My boards are finished, too.

The regulator is working fine, I could trim the input offset to 0mV but I have 2,5 and 2,7V at the external riaa and the output offset is fluctuating around underneath 1V.

I don't know if I should have the courage to connect it to my system
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Old 29th December 2012, 12:59 PM   #666
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Hello Pepperman,
what about a Dummyload ?
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Old 29th December 2012, 01:03 PM   #667
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When trimming the input offset did you use a dummy resistor instead of a cartridge ?
Something like 10 Ohm will do.
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Old 29th December 2012, 01:56 PM   #668
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I put a dummy load (10KOhm) across the input. As I said, I think the input is fine but what about the voltage across the ext. riaa and the fluctuating output? Should I put a dummy load across the output, too?
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Old 29th December 2012, 02:11 PM   #669
hesener is offline hesener  Germany
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10kohm is quite high, as it will see leakage current variations of the elcaps and the BJTs. Once it is adjusted, try putting 10Ohm across the input as JG suggests, and let us know what the output does. It should be fine, meaning, no more significant voltage fluctuations. In fact, while the elcaps are "forming" (and that can take a couple weeks of constant operation), you may continue to see output voltage fluctuations, and it may pay off to re-adjust the input offset after that time. No need to worry, though.

Some DC across the "Ext RIAA" connector is no problem, it indicates the DC offset of the output buffer that the servo is trying to correct. Ideally, it should be zero. I had -1.5V there, and it still sounded (mighty) fine.....
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Old 29th December 2012, 02:16 PM   #670
RCruz is offline RCruz  Switzerland
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Please try a 10 ohm load at the input.

Is your build inside a case ? The input is sencible to variations in temp due to passing air currents... it produces output variations.
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