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By an op amp in schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on a decade counter with internal through-hole thread WP-THRBU (https://www.we-online.de/katalog/datasheet/74650173.pdf REDCUBE THR with internal through-hole thread WP-THRSH (https://www.we-online.de/katalog/datasheet/74651174.pdf REDCUBE THR with internal through-hole thread WP-THRBU (https://www.we-online.de/katalog/datasheet/74650174.pdf REDCUBE THR with internal through-hole thread WP-THRSH (https://www.we-online.de/katalog/datasheet/74651173.pdf REDCUBE THR with internal through-hole thread WP-THRSH (https://www.we-online.de/katalog/datasheet/74651194.pdf REDCUBE THR with internal through-hole thread WP-THRBU (https://www.we-online.de/katalog/datasheet/74650194.pdf REDCUBE THR with internal through-hole thread WP-THRBU (https://www.we-online.de/katalog/datasheet/74655095.pdf REDCUBE THR with internal through-hole thread WP-THRBU (https://www.we-online.de/katalog/datasheet/74650174.pdf REDCUBE THR with internal through-hole thread WP-THRBU (https://www.we-online.de/katalog/datasheet/74650195.pdf REDCUBE THR with internal through-hole thread WP-THRSH (https://www.we-online.de/katalog/datasheet/74651174.pdf REDCUBE THR with internal through-hole thread WP-THRBU (https://www.we-online.de/katalog/datasheet/74650173.pdf REDCUBE THR with internal through-hole thread WP-THRBU (https://www.we-online.de/katalog/datasheet/74650195.pdf REDCUBE THR with internal through-hole thread WP-THRBU (https://www.we-online.de/katalog/datasheet/74650094.pdf REDCUBE THR with internal clock signal (possibly external). Commonly called a "Baby 8". 0 0 Y N 1 F N DEF SW_3PDT_x3 SW 0 40 Y N 1 F N DEF SW_NKK_GW12LJPCF SW 0 0 vertex -0.4 3.34544 6.59 facet normal 0.049906 0.0857116 0.995069 vertex -6.83882 4.66263 19.9688 facet normal -0.678811 0.362975 -0.638329 facet normal 1.437734e-14 -1.000000e+00 2.237444e-15 facet normal 3.533242e-16 -1.018103e-15 -1.000000e+00 facet normal 9.683078e-01 -2.497601e-01 0.000000e+00 vertex -9.657885e+01 9.175388e+01 2.655000e+01 facet normal 0.0819688 -0.0815293 0.993295 vertex -5.39246 -4.12472 7.87006 facet normal 0.114014 0.061823 0.991554 facet normal -8.947822e-02 -3.134218e-04 9.959887e-01 vertex -1.074910e+02 9.725134e+01 1.151572e+01 vertex -1.073615e+02 9.695134e+01 1.152727e+01 facet normal -0.990438 0.0975473 0.0975565 vertex 0.0606976 8.99402 4.51215 facet normal -4.589668e-01 -8.884534e-01 -0.000000e+00 facet normal 0.539147 0.334131 0.773096 facet normal.

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