[sdiy] Doepfer DIY Synth

[David G. Dixon]

Hey Simon,

Any pot which adjusts the time constant of a passive RC network is almost
always 1M log, as you have already noted.  Otherwise, the rest are all
either attenuators or straight pots, and can be linear and just about any
value you like.  Lower values give more linear response curves into finite
impedances, while higher values use less current and therefore don't tax
your power supply as much.  I buy B100k (the "B" means "linear") Alpha pots
by the hundreds to use for all of these applications.

> I got my Doepfer DIY synth board delivered last week. Hoorah!
> 
> Unfortunately you don't get any more info than is on the site. Boo!
> 
> There is a circuit diagram but it doesn't list all of the values for the
> pots.  And with my distinct lack of knowledge I don't know if a pot
> should be lin or log let alone what value it should be!
> 
> So any help with this would be appreciated even if some one could
> explain how I work it out.
> 
> Listed below are the various modules with the pots required with some
> values filled in but mostly not...
> 
> VCO
> Tune -
> Fine tune -
> FM (exp) -
> FM (lin) -
> PW -
> PWM -
> 
> 
> ADSR
> Attack - 1M log
> Decay - 1M log
> Sustain - 50k lin
> Release - 1M log
> 
> 
> VCF
> Audio in 1 -
> Audio in 2 -
> Frequency -
> FM1 -
> Fm2 -
> Resonance -
> 
> 
> VCA
> Audio 1 in -
> Audio 2 in -
> AM -
> Init Gain -
> 
> 
> LFO
> Frequency - 1M log
> 
> 
> Slew Limiter
> Slew time - 1M log
> 
> Thanks Simon
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