General principle:

• A DIY synth made of compact, cheap and relatively simple modules
• Using classical and easy to find electronic components with a preference for simple transistors and operational amplifiers instead of dedicated integrated circuit
• Using through hole components to obtain boards that everybody can weld
• A maximum of potentiometers, switches and connectors soldered onto the pcb to be fixed directly on the front panel
• Two sides PCBs with generous ground planes

Operating principle