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Of diodes and support 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 the footprint. Some options: Bourns PTL series, such as: * https://www.mouser.com/ProductDetail/Bourns/PTL30-15O0-105A2?qs=fV9UsjselOEqdQiKFAm%2Fog%3D%3D (A1M, orange LED, 30mm travel, 15mm shaft * https://www.mouser.com/ProductDetail/Bourns/PTL30-15R0-103B1?qs=X8nz4ozed5glbMOCRmYKzw%3D%3D (B10K, red LED, 30mm travel, 15mm shaft https://www.mouser.com/ProductDetail/Bourns/PTL30-15R0-103B1?qs=X8nz4ozed5glbMOCRmYKzw%3D%3D (B10K, red LED, 30mm travel, 15mm shaft) * https://www.mouser.com/ProductDetail/Bourns/PTL30-15R0-103B1?qs=X8nz4ozed5glbMOCRmYKzw%3D%3D (B10K, red LED, 30mm travel, 15mm shaft ** https://www.mouser.com/ProductDetail/Bourns/PTL30-15R0-103B1?qs=X8nz4ozed5glbMOCRmYKzw%3D%3D (B10K, red LED, 30mm travel, 15mm shaft https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15R0-103B1/3781301 (red B10K) and https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15O0-105A2/7314942 (orange A1M The first two groups should be possible, too * See manual step (sw13 // 1 for run/stop (sw14) // 1 for 5v / 2.5v output mode (sw12) // 1 rotary switch with Signal Lamp, generic K switch normally-open pushbutton push-button D Push button switch, generic, two pins Switch, single pole double throw K switch dp3t ON-ON-ON D Switch, single pole double throw, separate symbols K switch spdt single-pole double-throw spdt ON-ON D Screw terminal, single row, 01x03 D 2x5 pin shrouded header 2.54 mm spacing Pin header 2.54 mm 2x5 Audio Jack, 2 Poles (Mono / TS *(optional) SIP socket, 2.54 mm, 1x10 Pin header, 2.54 mm, 1x4 Light emitting diode Push button switch, generic, two pins | Dailywell | PAS6B3M1CESA3-5 or PAS6B3M1CESA2-5 | Tayda | A-1847 | | J1 | 1 | Synth_power_2x5 | 2x5 pin shrouded header 2.54 mm spacing | | | | | | C3, C4, C10 | 1 | 100k | Resistor | .

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