Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

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Subject: Re: [PolySix] Re: Non-working attenuator

From: Bob Grieb <bobgrieb@yahoo.com>
Date: 2015-01-02

The layouts are available on the web.   You should be able to
see what's happening with just a voltmeter.

With a 3.9V zener and 120 ohm to ground, you should get
3.9V across the zener, roughly, and 1.1V to ground.

     Bob

From: "tuk88@rocketmail.com [PolySix]" <PolySix@yahoogroups.com>
To: PolySix@yahoogroups.com
Sent: Friday, January 2, 2015 12:35 PM
Subject: Re: [PolySix] Re: Non-working attenuator

 
I've got 3.35 V on pin 2 and 5V on pin 3. Normally, that works fine. But at the output, 0V. So I think that the LM393 is brown.

Howether, I'm looking for this strange voltage on the input 2 of IC5. I think there is a mistake on the Clone PCB. Because the voltage divider looks like to works fine.

I will contact the PCB maker to have the layout picture to check where the trouble come from.

I'll keep you in touch

Lucas