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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
noise toaster troubleshooting
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timpecter



Joined: May 24, 2014
Posts: 2
Location: UK

PostPosted: Wed Jun 04, 2014 7:11 am    Post subject: noise toaster troubleshooting Reply with quote  Mark this post and the followings unread

Hi there, I picked up the Make: Analog Synthesizers book and had a go building the Noise Toaster. I have the board populated and a temp carboard faceplate wired up with all the pots and connections.

I have tested it and the noise generator and LFO both seem to be working as expected. The filter affects the noise as I would expect when I move the frequency and resonance pots.

The two issues I could do with some help with are:

I can't seem to get the VCO to produce any of the waveforms.

The AR seems to work in manual mode but in repeat it does not.

If you have suggestions on how I could troubleshoot these two I'd be very appreciative.

I did etch my own board, which was probably a bad idea, but I have examined it quite carefully and I'm not seeing any breaks, shorts, or cold joins. That is not to say they don't exist.

Thanks!
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timpecter



Joined: May 24, 2014
Posts: 2
Location: UK

PostPosted: Tue Jun 24, 2014 2:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

Well, I have been diligently troubleshooting in my spare time, starting with the AR generator.

The first thing I did was to compare a breadboarded version of the circuit to the one on the board and I noticed something which I think is strange but it might be perfectly normal.

When the circuit is in manual mode, and the A and R pots are fully counter clockwise, I get about 8.10V p-to-p on the signal at X17, X18, X22, on the positive side of C18.

I can adjust the R control to clockwise and the signal remains about 8.10V p-to-p

If I begin to adjust A clockwise, the signal rapidly shrinks down to 500 mV or so.

If I leave A fully counterclockwise I can adjust R clockwise and the signal remains 8.10V.

This behavior is the same for both the breadboard and PCB builds but when I simulate the circuit in ltspice the adjustment of A does not affect the p-to-p of the signal.

Is this expected? Does anyone know what the explanation might be?

(I've attached the schematic of the AR section.


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