[sdiy] Student successfully hacked flanger pedal

[mark verbos]

You can use 2 vactrols controlled from the same control voltage. One is 
where you have it, the other is in the feedback loop of the summing 
op-amp in order to linearize the response.

Mark




Derek Greene wrote:
> You know.. that's so crazy it just might work.. I feel dumb know.. I was 
> completely over thinking that one. Thanks. One other problem though:
> 
> The flange's frequency need to be swept linearly (like the pedal does 
> originally). The response of the vactrol is logarithmic. I haven't 
> tested it yet.. but does anyone know if the 100k pot in the crybaby 
> (Dunlop original) is an audio taper (log) pot or not? Would this even 
> help my problem if it is (I am assuming the log response of the pot 
> [thus the voltage] will cause a linear response of the vactrol's 
> resistance [and the BBD's frequency])...
> 
> However, this still causes an external voltage source (that isn't my 
> modified crybaby with a log pot) that sweeps linearly to give a 
> logarithmic response... any suggestions?
> 
> Thanks again Scott for the quick response (sorry I accidently respnded 
> to you already and not "all").
> 
> -Derek