Heliodor Amp Overdrive

OVERDRIVE

The Heliodor Amp Overdrive is a DIY overdrive project based on the classic BOSS OD-3 Overdrive circuit adapted for true bypass operation. It uses a discrete op-amp JFET topology to create smooth amp-like natural gain and dynamic response suitable for low-to-mid overdrive tones. The design retains the core characteristics of the original with controls for drive, tone, and output volume to shape the effect.