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Another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another 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 arduino nano clone (atmega 328p), 12-bit dac (mcp4726) and small amounts of supporting hardware Microcontroller and smoothed PWM https://kassu2000.blogspot.com/2019/10/quantizer.html using a setscrew). (ShaftLength must be non-zero. RingMarkings = 10; knob_smoothness = 20; // // Whether to place the knob (in mm). HoleDiameter = 6; //knob_radius saw_out = [third_col, third_row, 0]; saw_out = [h_margin + working_width/4, row_1, 0]; fm_pot = [input_column - h_margin/2, bottom_row, 0]; pwm_duty = [input_column, bottom_row, 0]; pwm_duty = [input_column, row_2, 0]; fm_in = [first_col, first_row, 0]; //Second row interface placement f_tune = [width_mm/2 - h_margin, top_row, 0]; left_rib_x = thickness * 1.2; right_rib_x = width_mm - thickness*2.2; left_rib_x = thickness * 1; right_rib_x = width_mm - right_rib_thickness; //} module make_surface(filename, h) { for (a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]) linear_extrude(height=a/h, convexity=10) projection(cut = true width_mm = 70.8; // 14HP×5.08mm = 71.12; ES for 14HP is 70.8 c_tune = [second_col, fifth_row, 0]; square_out = [third_col, fourth_row, 0]; //Fifth row interface placement f_tune = [second_col, fifth_row, 0]; pwm_duty = [width_mm - h_margin - working_width/8, row_3, 0]; pwm_duty = [width_mm - h_margin - working_width/8, row_2, 0]; fm_lvl = [second_col.

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