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 Forum index » DIY Hardware and Software » Jürgen Haible designs
Debugging Living VCO
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janvanvolt



Joined: Nov 24, 2005
Posts: 285
Location: Mainz, Germany

PostPosted: Wed Oct 28, 2009 6:05 pm    Post subject: Debugging Living VCO Reply with quote  Mark this post and the followings unread

I just finished my Living VCO including all wiring, but:

- no short on the +/- or GND rails (measured)
- no saw or pulse on ANY of the 3 vco's (so. nothing literally)
- when switching between PULSE/SAW i notice a "click" and a audible hum (very low, but audible) which might come from the TL's.
- Wiring is Option 3

So my assumption: there's something with the CORE's as all three do not sound.

any idea where to look first ?

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davebr



Joined: Jun 09, 2007
Posts: 181
Location: portland, or

PostPosted: Wed Oct 28, 2009 9:45 pm    Post subject: Debugging Living VCO Reply with quote  Mark this post and the followings unread

I would start with minimum wiring. Power to one VCO only. No connections to CVS_?, Freq_?, LinDet?, PW_?, PWM? or Pulse?. Use the Freq trimmer to adjust. Check for low level signal on Saw. You only have the expo converter and the core to verify. If something is wrong here then start checking parts values. A scope on the waveform is always useful.

Dave
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JoeMorris



Joined: Apr 26, 2009
Posts: 160
Location: Brighton

PostPosted: Sun Jan 10, 2010 2:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Just finished this, sounds great.
One question...
My LFO seems to run quite fast, with a minimum speed of around 20hz...
Is this right?
Joe
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JoeMorris



Joined: Apr 26, 2009
Posts: 160
Location: Brighton

PostPosted: Sun Jan 10, 2010 3:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

doh... that was supposed to be in variable slope filter....
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bennethos



Joined: Apr 18, 2009
Posts: 31
Location: Belgium

PostPosted: Thu Feb 11, 2010 12:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Any news on you're debugging ? Smile

I'm also debugging... I have 2 out of 3 working like 75% ...

Check also the power on your ic's (pin layouts can be found by looking at the datasheet).

You definitely need a scope ! And like dave brown said minimum wiring. I only have a cable on the saw output (connected to my oscilloscope) & frequency with a 10 turn dial (don't short it ! ).
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