The reason why I chose this over digipots, cheaper, and it seams a lot easier to do large volumes. Vactrol as adjustable resister, this is straight forward but as it is likely to be used to replace pots in an effect pedal, I am thinking of easy way to just unplug a pot and plug in the vactrol. Vactrol as voltage divider, getting the correct circuit for this is essential to control the Audio.ģ. The PWM to voltage filter, there are so many online, many will need to be tested to find out which is the best.Ģ. The following are the challenges of concern. I ma waiting for the PWM module to arrive, as well as a simple midi shield for the nano. Axo will send midi data to an arduino nano, which will interpret and send instructions via I2C to a PWM module, the PWM will then be filtered into a voltage, then connected to the LED of the vactrol. Still doing a few other things first before I dive in the deep end, but I have started tinkering, they are far too expensive to buy, so yes its DIY Vactrols.īecause I intend to build quite a few, I have ordered 50 LED's, 50 LDR's, next was to find an acceptable build, I have gone with and led with end sanded flat, glued to an LDR with a tiny bit of clear silicon, then into clear heat shrink, then positioned into black plastic tube (outer casing of a cable) just big enough to fit, then both ends sealed with molten black wax. So anyway, the lesson here is that digipots may not solve all your conundrums in building the perfect guitar system, but you might discover some weird things if you hack a pedal to use one and play around with it. I expected it to be a straight tone sweep, so something is clearly going on that I don't understand (but I like it). I have no idea why the pedal clearly jumps from one note to the next in the 2nd case. In the second case, it is a sine wave with a steadily progressing frequency. In the first case, the pattern is a partial sine-wave sweep with some glitches (zeroed-out spots) in a particular sequence. In both cases, I am using a Teensy to control the digipot. In this little clip (which was recorded straight with my laptop, so the audio quality is especially poor), I am first just letting the pedal do its thing, and then I layer some guitar stuff over it.
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In the clip, which is extracted from a full song, I am playing rapid chords at first and then I just let the guitar/pedal ring out and feed back.Ģ) modulating the fuzz "knob" at audio frequencies seems to send this circuit into oscillation in ways I do not totally understand.
A demo of this effect is in this little sound clip: I have no idea what that is from, but I like it).
I ended up discovering two things that I found musically interesting:ġ) modulating the fuzz tone with weird patterns to create an unusual rhythmic shift (which, given this pedal, also seems to create some sound that is reminiscent of some large beam of wood creaking. So far this is the only pedal I have tried this with (but I have some others waiting. I have a modified clone of a Lovetone Big Cheese that I made and I set it up specifically for this purpose, putting in a switching jack that I can use to swap a digipot in for the fuzz control. These are not attempts to use a digipot for presets or to control commercial pedals. As promised, here are some sound clips of weird things that I was able to do with a digipot that I liked.
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