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4bitsynth is 4 bit MIDI-controlled digital synthesizer inspired by the NES. The project is built around Atmel AVR ATMega48 The digital output is put through an R-2R resistor ladder to get the analog waveform. It has three type output : Square wave, Triangle wave and noise.
Project Features Detail :
Triangle
- One volume (uses up/down counter)
- Pitch sweep (up/down, optional looping)
- Standard pitch bend
- Fine pitch bend
Square
- Three duty cycles: 12.5%, 25%, 50%
- Volume decay (optional looping)
- Pitch sweep (up/down, optional looping)
- Standard Pitch bend
- Fine pitch bend
Noise
- Two modes: 93-bit and 32k (think NES)
- Volume decay (optional looping)
- Pitch sweep (up/down, optional looping)
- Standard pitch bend
- Fine pitch bend
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