I'm at Superbooth.
TS-303 GT Acid Screamer prototype
Analog distortion for the TB-303 and pretty much everything else.
Totaly bonkers circuit design with Vbe multipliers, Gyrator, Capacitance multiplier and Negative Impedance Converter in a feedback loop with ridiculously high gain.
Replacement for the IR3109. Sounds and behaves exactly the same.
It even does the distortion that happens in the MC-202 and SH-202 when you run them at low voltage or almost empty batteries.
It's also DC-accurate. So, it also works in the portamento circuit of early Jupiter 4's.
2x1cm 6-layer pcb with plate capacitors to fit everything in the DIL-sized footprint of the original chip
Gravitaional Slingshot upgrade for the Juno-106 (and all other synths that use the 80017A hypbrid modules).
It features a filter pushed far in the non-linear region and Q-compensation placed outside of the Resonance feedback loop. This lack of in-loop Q-compensation make the signal level in the filter vary with input signal and resonance amount, and the non-linearity causes the filter to self-modulate.
Instead if one sharp frequency peak generated by resonance, you now have multiple. Less squelchy than the original voice chips, but a much richer texture in the lower regions.
See the original as a young soprano and this gravitational slingshot as a old, well-trained, voice that has smoked a bit more and drank loads of whisky.
AR662-DOT & AR662-VCA
Exact sounding and behaving replacements for the BA662
There is an entire mythology and cult around the BA662 and I'm still writing a forthcoming article "Fairies, Dragons and the BA662" that should explain a few things... And yes, I have it's design.
Many so called "clones" have surfaced in the past years. From simply replacing it with another OTA, to an OTA with extra current mirrors, to a discrete copy of the LM13700 minus the buffer and linearizing transistors, claiming to be based on a document that simply does not exist.
None of them are even close to the original one and all of them have problems. Some have minor ones, others have thermal runaway that can cause them to self-destruct or blow the power supply of the synth in which they are used.
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