Electronic Audio Experiments Halberd V2

Controls

• Pre: This sets the overall signal gain. Lower settings impart light compression, then increasing amounts of clipping up to a fuzzy overdrive, depending on the Voice and Depth settings.

• Depth: This is an adjustable low frequency shelving filter at the input, and is very interactive with the setting of the Pre control. It can be thought of as a second gain control affecting low frequencies only.

• Tone: This is an adjustable high shelf cut at the output, helpful for taming harsher frequencies especially at high gain settings.

• Post: This sets the overall output level, and is buffered for full transparency at all signal levels.

• Voice: 3 position switch to set the overall drive character

  • Clang (up): increases gain in the upper midrange, for an aggressive sound and a sharp attack

  • Standard (middle): moderate gain with a gentle mid push; identical to Halberd V1

  • Deep (down): a full range gain boost with woolly saturation and a fuzzy note attack

Changelog

Version 2 (Released in August 2021)

• New mechanical form factor; size reduced from BB-type enclosure to 125B-type enclosure.

• NOS germanium transistor no longer used. Supporting circuitry updated to preserve tonal characteristics.

• Current draw reduced to 50mA when engaged (previously ∼180mA in V1)

• Bypass switching converted to fully electronic CMOS switch

• Added Voice toggle.

• Added PSU input over-voltage protection.

• Low control renamed to Depth; High control renamed to Tone.

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