I just got through last week ordering new pots for my Craig Anderton ring
mod. Now I'm thinking, how do I change this to work with the MOTM audio
in/out levels?
I'd also like to do another mod... This ring mod only has one audio input.
The other signal that modulates the input is the onboard carrier osc. which
is set by a pot. This means that it's usually a static setting unless you
tweak the pot as you play.
I'd like to mod it to have CV control over the carrier freq. but have no
idea how to go about it. Would I have to use a OTA for this or just patch in
a CV through a resistor directly to where the pot is connected? This IC used
is a 565 pll.
Thanks,
Andrew Sanchez
In a message dated 12/3/00 1:53:34 PM Central Standard Time,
djthomaswhite@... writes:
>
> just thinking about a new project at home and wanted to ask around about
it.
>
> Has anyone built a Paia provided Electronics Projects For Musicians (EPFM)
> Super Tone Control Before?
>
> This is a Craig Anderton design from the late 70's based around a quad
> op-amp in a design that is actually a filter (12dB I think) Anyway, I have
> an old one of these from my EPFM days complete with rosin-core solder
still
> on the board, YIKES! It makes a cool textured filter sound, but has no CV
> inputs...stock anyway. I was reading the project notes for this and
> discovered that it can be modified with 2 resistors and caps changed to
work
>
> with 10v peak to peak voltages. Perfect with MOTM. My next problem in
> adapting it was the CV inputs.
>
> So I got my old Super Tone Control (STC) out of its Frac-Rak and started
> with the voltage testing. I found that the frequency with no CV inout jack
> was reading 0-5v response. I figure I can patch a cv right in place of
this
> pot and whammo, I will have at least a dirty CV input of sorts. Wait
> though... upon further reading, I discovered that you can also get the
> envelope follower kit from the EPFM book and hard wire it up to the STC.
> This of course allows the filter to be controlled by the audio signal at
the
>
> input. I read the description of the schematic and the input circuitry
> converts the audio to 0-5v DC as expected to control the frequency of the
> STC. I should be able to feed a CV into the EF socket as well and use it a
> CV input for the frequency. I will also be able to control the sensitivity
> and sweep range of this CV due to the controls on the EF.
>
> Another mod I want to make is to have individual outputs for the three
> filter responses. This filter has High, Band and Lowpass sections with an
> attenutaor for each one feeding a summing mixer for the output. I want to
> split each signal out to a duplicate circuit of the output on the STC to
> buffer and amplify each filter response. Now the STC will have a Mix out
> with attenuators for each response and individual outs for other uses.
>
> Unfortunately the STC filter does NOT self-oscillate. :~( Sad time, but
> there is a resonance boost switch in the circuit that gives an almost
> shell-resonance type effect to your sounds. I always use this to my
benefit
> with my old STC to make percussion samples.
>
> I plan to mount this thing into a 3-space MOTM panel with full pot upgrade
> and components replacement for the long run in as many places as possible.
> Where do you get the shielded wire Paul? Part-number? I want the exact
same
> if you can dig it. I know this is knid of off topic, but you guys are the
> first guys I have to ask in this situation. Thanks to Paul for the MOTM
> format inspiration and teaching me to use better components (My old Paia
> stuff iscratchy all over at 2 years old...Yikes)
>
> Thomas White
>