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Old 24th July 2011, 05:09 PM   #661
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Quote:
Originally Posted by WaltJ View Post
I suggest a very simple check that could be helpful. With the spurious signals displayed, switch off the power to the reg, and see what changes.

All instances of oscillation I've seen with these regs have always been with tens if not hundreds of mV of sine wave output. I do agree with the observation that a time domain plot won't show this lower level stuff.

wj
Yes, I did exactly that, but didn't take a pic -- you can still see the signal at 770kHz from WABC-AM, and a little less for WINS-AM (1,100kHz) and WFAN (660kHz). I'm not going to spend too much time on this, will measure once they are all boxed up, but I don't think it's going to be an issue. I think that with the layout on the Old Colony boards there's not enough opportunity for energy from these signals to promote oscillation.
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Old 7th August 2011, 01:12 PM   #662
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Happy to report that WABC, WINS and WFAN were removed once the Super Regulators were housed in Hammond 6x4x2 boxes.
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Old 7th August 2011, 02:38 PM   #663
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Maybe you have written it somewhere but which pcb did you use in this test?
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Old 7th August 2011, 03:09 PM   #664
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These tests were done with the Old Colony (AudioXpress) boards -- and the leads to the spectrum analyzer were my good pomona's. The radio stations showed up when the regulator was un-housed.

I would say it's a good recommendation to refrain from using a plastic or wood case for anything using an AD797 in a high gain configuration.

and just to reiterate -- i've had no issues with oscillation with the AD797 and the OCS boards.
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Old 21st December 2011, 07:58 AM   #665
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Maybe you have written it somewhere but which pcb did you use in this test?
Hi i am interesting by your free PCB SSR01 Sjöström Super Regulator ,if it's not too late .

I tried to send you a private message but it's not possible .

Thanks

Serge
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Old 21st December 2011, 08:23 AM   #666
Electrons are yellow and more is better!
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As I write you should send me an email. Hurry up since only two free samples are left.
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Old 21st December 2011, 09:43 AM   #667
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As I write you should send me an email. Hurry up since only two free samples are left.
I must be a stupido !!!! when i try to send you an email on your profile ...
I don't find a link to your email address .
Please send me a message on my profile with your email

Thanks
Serge
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Old 21st December 2011, 12:57 PM   #668
Electrons are yellow and more is better!
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Just click at my name and choose email in the popup menu.
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Old 21st December 2011, 02:07 PM   #669
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Just click at my name and choose email in the popup menu.
..... when i do it ,i have a page from the Support Center ...

It does not matter
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Old 21st December 2011, 04:19 PM   #670
Electrons are yellow and more is better!
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Have you ever succeeded to email someone? Maybe you are under moderation? Get in touch with me through my homepage.
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