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Schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the lower 5 mm | | | S1 | 1 | 2_pin_Molex_connector | KK254 Molex connector 2.54 mm spacing D 2 pin Molex connector 2.54 mm spacing D 3 pin Molex connector 2.54 mm spacing KK254 Molex connector 2 pin Molex connector 2.54 mm spacing DEF 2_pin_Molex_connector J 0 40 Y N 2 F N DEF SW_Push_Lamp SW 0 0 VCO details from Moritz Klein (and derivatives 1 0 20.5 vertex -0.95 7.77656 6.96334 vertex 0.95 5.48429 22.5 vertex.

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