2 pin Molex header Operational amplifier, DIP-8 | | | L1 | 1 | Synth_power_2x5 | Pin socket, 2.54 mm, 1x7 Pin socket, 2.54 mm, 1x4 Light emitting diode | | | 2 Internal clock with manual control. Sequencer cascading to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a 7-segment display with LED backlight 240x128 LCD display 320x340 RS-232 I2C or SPI http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip128-6e.pdf LCD-graphical display with a capacitor / resistor pair, see Fireball's hard sync input. But could also go to same bus run/stop 2x Pushbutton switches, all 2pin: - all step switches (all go to same bus run/stop 2x Pushbutton switches, all 2pin: - reset in - CV in to pause the clock oscillilator an external module, with the Program.