DGWVI
Well-known member
- Build Rating
For some reason I'm constantly getting asked lately if I can make the Stereo PolyChorus, despite it being a different circuit from the OG, and whoever asking primarily wanting to get the RFUS intro sound. I don't get it, and I don't care to
Anyway, with this one I decided whatevs, and took up this commission. I've immplemented a faux stereo output, with a similar scheme to that found in the reissue (one side of the FX signal out of phase with the other). I also added a buffered dry output similar the OG, a feedback path inversion, a delay clock cap doubler, and a parallel expression input for the Tune pot.
All of these mods involve basically just hacking a few extra buffers onto the board- The input is sent to a Kliche buffer, which is split between the FX send and dry out, while the "stereo" out and feedback inverter both utilize the
Parasit Simple Buffer and Inverter, with the stereo out using the output of each op-amp for its widening effect, and the feedback inverter using the toggle for its action.
The feedback inverter is inserted between lug 2 of the FDBK pot and R32. The only change to that is an increased feedback resistor in the inverting stage from 10 to 11k
The clk cap doubler is just an additional 22p switched into the C43 spot/ parallel to C42
I wanted to ensure I had enough room for all the added jacks and four extra boards, so I used a Hammond 1590X, which is 2.2" deep, but otherwise shares dimensions with the XX. Used my standard white ink on classic matte black, with the Tayda knockoffs of the Brutalist / Contempo knobs. I was feeling saucy, so I tried to use as many Motorola chips as I could, with the LT being the only TI part. Think the BA4560s are Rohms
Had to use the C45 slot for a 47p to get the clock frequencies in range, but otherwise calibration was fairly easy considering. The hardest bit was setting the volume to balance with the bypassed signal
I need to borrow another mic, but I should be able to get a demo tomorrow
Here's a direct to board recording -
Anyway, with this one I decided whatevs, and took up this commission. I've immplemented a faux stereo output, with a similar scheme to that found in the reissue (one side of the FX signal out of phase with the other). I also added a buffered dry output similar the OG, a feedback path inversion, a delay clock cap doubler, and a parallel expression input for the Tune pot.
All of these mods involve basically just hacking a few extra buffers onto the board- The input is sent to a Kliche buffer, which is split between the FX send and dry out, while the "stereo" out and feedback inverter both utilize the
Parasit Simple Buffer and Inverter, with the stereo out using the output of each op-amp for its widening effect, and the feedback inverter using the toggle for its action.
The feedback inverter is inserted between lug 2 of the FDBK pot and R32. The only change to that is an increased feedback resistor in the inverting stage from 10 to 11k
The clk cap doubler is just an additional 22p switched into the C43 spot/ parallel to C42
I wanted to ensure I had enough room for all the added jacks and four extra boards, so I used a Hammond 1590X, which is 2.2" deep, but otherwise shares dimensions with the XX. Used my standard white ink on classic matte black, with the Tayda knockoffs of the Brutalist / Contempo knobs. I was feeling saucy, so I tried to use as many Motorola chips as I could, with the LT being the only TI part. Think the BA4560s are Rohms
Had to use the C45 slot for a 47p to get the clock frequencies in range, but otherwise calibration was fairly easy considering. The hardest bit was setting the volume to balance with the bypassed signal
I need to borrow another mic, but I should be able to get a demo tomorrow
Here's a direct to board recording -
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