The modular synthesizer kick drum module is developed using Arduino programming and aims to replicate the Roland TR kicks, specifically the MS-20mini kick. Resonance modulation is key to achieving the desired distortion. The user interface includes four knobs controlling pitch, harmonics, decay, and attack. Powered by a single 5V or 12V supply, it features TRIGGER IN for kick triggering and an audio OUT ranging from -2.5 to +2.5V. Distortion is achieved through PWM control, eliminating the need for a Transistor-VCA circuit. A diode clip introduces distortion, while a 2-pole passive filter cuts undesirable high-frequency components for a clear sound. The high-speed PWM maintains low output impedance. The result is a compact, affordable module catering to musicians and synth enthusiasts with precise control and unique distortion capabilities.
Problems, nothing is heard, PCB error? Currently no time for debugging. Updates will follow.
The code and circuitry originate from HAGIWO.
I've contributed by designing the PCB, creating the front panel, ensuring a clean layout, and providing a Bill of Materials (BOM). The intention is to simplify the replication of these modules for others.
Download the Gerber files and order the boards from JLCPCB / PCBWay or others. Order the components from the BOM and solder them by hand. I chose 0805 SMD components because they are still easy to solder by hand.
You can simply redesign the front PCB for visual adjustments. To do this, log in to EasyEDA, upload the PCB/EasyEDA_PCB_FrontPlate.json and customize the "board". There are no components on the board. Only the holes and dimensions have to fit. Have fun!
