Schematic ((exclusive)): Hm-2

This arrangement contributes to the "square wave" character of the distortion. When the waveform is clipped harshly, it results in a sound that is perceived as "buzzy" or "raspy." While this is often undesirable in a blues context, it provides the cutting aggression required for heavy metal riffs.

The HM-2 schematic is well-documented and has inspired many clones (e.g., Behringer HM300, TC Electronic Eyemaster). For a DIY build: hm-2 schematic

The HM-2 circuit is built around several distinct subcircuits that work in tandem to produce its high-gain character: This arrangement contributes to the "square wave" character

: The circuit starts with a buffered input followed by a pre-distortion tone-shaping circuit that pushes the gain stage into its signature "fuzzy" saturation. 2. The Secret Sauce: The Gyrator EQ The most defining part of the isn't actually the distortion—it’s the (EQ) section. Fixed Peaks For a DIY build: The HM-2 circuit is