The Heliodor Amp Overdrive is a do-it-yourself overdrive project inspired by the iconic BOSS OD-3 Overdrive circuit, modified for true bypass functionality. It employs a discrete op-amp JFET architecture to deliver a smooth, amp-like natural gain and dynamic response, perfect for low-to-mid overdrive sounds. The design preserves the essential features of the original, featuring controls for drive, tone, and output volume to customize the effect.