A Feature-Rich Drum Machine

Per Hackaday, a custom-built drum machine from maker Igor features sixty-four sequencer steps, force-sensitive drum pads based on piezo sensors, and multiple drum voices constructed from op-amps and passive components. All the schematics are published for anyone interested in recreating the build. What elevates this beyond a typical hobby project is that Igor built custom DRAM—from discrete components—to make the machine programmable, transforming what could have been just a playable instrument into a genuine recording studio tool.

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