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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
Simple saw/ramp switch for Super Pyscho LFO
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synthmonger



Joined: Nov 16, 2006
Posts: 578
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PostPosted: Tue Jun 09, 2009 12:10 pm    Post subject: Simple saw/ramp switch for Super Pyscho LFO
Subject description: A switch and a diode
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While I was messing around with my CV modulation source that uses a 40106 as the main oscillators, I found adding a diode in either direction across the input and output pins you can get a rising or falling saw wave on the input pin and a 1ms trigger on the output pin. Using a resistor in series with the diode changes the shape/duty cycle. I would not recommend using a potentiometer for variable shape control as it flops out with a change in frequency.

The sawtooth wave form must be buffered with offset/gain controls for a symmetrical wave form. If you add this buffer to my 40106 VCO I posted on the lunetta forum it will work the same way.

So I guess it's time to make 6 VCO sawtooth core oscillators module? Smile Now if I could only figure out how to make them thru-zero....

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