Micromoog - can't hear the sub-oscillator

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Micromoog - can't hear the sub-oscillator

Postby Scories » Tue Feb 07, 2012 3:53 am

Hello. I've received a Micromoog, even though it was safely packaged, the doubling function seems to be defective.
I can't hear the sub oscillator when I turn the knob. I only hear some sort of a phase shift and volume decrease.
Anyone knows if this is critical? Maybe a small soldering job will do...
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Re: Micromoog - can't hear the sub-oscillator

Postby atkbg » Tue Feb 07, 2012 4:33 pm

First off, check the pot for dead spots. (This is more likely the cause)

If the pot is OK, the next is more difficult. You do have a dvm, right?

The sub is actually a digital chip IC 404CMOS.
I'd start by checking for 15v+ on pin 14 of the chip.
Check for 15v+ on R428. I recently seen SIP pack go on micros. They were once thought of as infallible, but are beginning to show signs of deterioration.
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Re: Micromoog - can't hear the sub-oscillator

Postby Scories » Tue Feb 07, 2012 6:55 pm

Thanks a lot for the advice.

Is good or bad news? I mean, is it easy (and cheap) to find that IC 404 CMOS digital chip?

My Micromoog has obviously been barely used. Sometimes, componnents just dries up when not used enough.
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Re: Micromoog - can't hear the sub-oscillator

Postby atkbg » Tue Feb 07, 2012 11:08 pm

Don't jump to point 2 until you've tested point 1!

Just because its dark doesn't mean the sun collapsed! I might just mean you haven't turned on the light!

Check the easy stuff first. With a dvm, check the wiper on the Double pot.

We'll take it the next step *if necessary*.
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Re: Micromoog - can't hear the sub-oscillator

Postby Dr X » Tue Jul 03, 2018 2:49 pm

Hi,
Did you find out about this? I have the same problem myself, would be great with some more information.
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Re: Micromoog - can't hear the sub-oscillator

Postby Broadwave » Wed Jul 04, 2018 7:22 am

Scories wrote:Thanks a lot for the advice.
Is it easy (and cheap) to find that IC 404 CMOS digital chip?


IC404 is a simple CMOS CD4013 Dual Flip-Flop (14pin DIP). You can get them very easily for £0.36p/€0.40/$0.50 - Farnell, Mouser, Radio Spares etc.
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