hi! this thing is a leaky push/pull sample and hold unit that is triggered when the derivative of the input changes sign or when the optional oscillator changes state. didn't really get to test that particular hookup yet, but should work ok : ).
detailed description: https://fleurshax.net/circuits/untested.htm#garage_drv
cheers,
spacecarrot : D
synchronized sample rate reducer
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Hi, welcome to the forum. Really interesting circuit - Can you explain a little more about how it works/what if does?
I get that the clean buffered input is fed through to the inverting output; Some of the dry signal is also heavily fuzzed and fed into a comparator which wiggles the two photofets that form either side of the voltage divider. So i guess this wiggles the vref of the inverting output stage, but also the dry signal seems to be fed via the photfets into the non-inverting input. What audible effect does this have on the signal?
I get that the clean buffered input is fed through to the inverting output; Some of the dry signal is also heavily fuzzed and fed into a comparator which wiggles the two photofets that form either side of the voltage divider. So i guess this wiggles the vref of the inverting output stage, but also the dry signal seems to be fed via the photfets into the non-inverting input. What audible effect does this have on the signal?
modman wrote: ↑ Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...
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hi!
yeah, i should probably post longer descriptions. so the idea here is that you tell a sample-and-hold thing to take a sample whenever the derivate of the input signal changes. the hookup around U1B, U3, U4 is such a sample-and-hold in a push-pull form that has a bunch of characteristics that work really nicely in this context. note the very small input cap of U2A and you will see that it is actually a differentiator. U2B doesn't have any hysteresis because this is a sidechain and we don't care about noise. the optional section is just a small square wave ring mod that works on the derivative of the signal, within the sidechain.
the sound you get from this has a lot of overtones while retaining good clarity, is very gritty and not at all "singing". notable for a distortion is that it has no compression, palm mutes and stuff like that doesn't work very well by default, but it can be paired with an overdrive or compressor pretty well.
cheers,
spacecarrot
yeah, i should probably post longer descriptions. so the idea here is that you tell a sample-and-hold thing to take a sample whenever the derivate of the input signal changes. the hookup around U1B, U3, U4 is such a sample-and-hold in a push-pull form that has a bunch of characteristics that work really nicely in this context. note the very small input cap of U2A and you will see that it is actually a differentiator. U2B doesn't have any hysteresis because this is a sidechain and we don't care about noise. the optional section is just a small square wave ring mod that works on the derivative of the signal, within the sidechain.
the sound you get from this has a lot of overtones while retaining good clarity, is very gritty and not at all "singing". notable for a distortion is that it has no compression, palm mutes and stuff like that doesn't work very well by default, but it can be paired with an overdrive or compressor pretty well.
cheers,
spacecarrot