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Fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version 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 the right sub-panel top_row = height - v_margin - title_font; saw_out = [output_column, row_2, 0]; fm_lvl = [h_margin+working_width/8, row_2, 0]; f_tune = [h_margin+working_width/8, row_4, 0]; pwm_cv_lvl = [second_col, fourth_row, 0]; pwm_cv_lvl = [second_col, third_row, 0]; //Fourth row interface placement f_tune = [second_col, second_row, 0]; //Third row.

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