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 Forum index » DIY Hardware and Software » Jürgen Haible designs
Playing with a living VCO, have a couple of questions.
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phdinfunk



Joined: Jun 04, 2008
Posts: 119
Location: Taiwan

PostPosted: Fri Nov 25, 2016 10:31 am    Post subject: Playing with a living VCO, have a couple of questions.
Subject description: Mostly, to implement an LFO mode and scale the tuning pot.
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Q1: What value would one change c3 to in order to switch in an LFO mode? (Or I could just switch a parallel cap in there). I want to be able to use my osc 3 as an LFO sometimes.

Q2: I'm trying to do this without multiturn pots. So, I'm thinking it might be nice to be able to scale the FREQ_1 pot for a less-wide sweep range. What value trimmer would be good in series with R5 to scale to something like a 3 octave sweep? (I'm using +/-12V). I would like to scale it for center, tune, left -1 oct / right +1 oct.

Q3: I've read a lot of people having issues with PWM and initial pulse width. Should I just install a trimmer in series with R39 to deal with this?

Thanks!

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