BLOODLETTER DIY PCB
Bloodletter is an unsound love letter to the appraised beast that is Boss HM-2. It was developed from ground up as a strikingly simple yet versatile alternative to its paragon. It’s similar enough to the HM-2 to gratify those who are looking for a clone while also including extra features that will delight the unsated chainsaw enthusiasts.
Bloodletter features:
- Brighter base tone and more presence than the HM-2, even when controls are dimed.
- Less fuzzy and more natural feel to its distortion texture.
- Controlled and smooth sweep in each control, including Gain.
- The classic Volume, Gain, High and Low control set with additions.
- Additional Mid control which has been designed entirely on being able to change the mid frequency content without ruining the chainsaw aspect of the tone.
- Additional transparent Blend control which everyone loves.
- Additional Response 3-way switch that changes the tone between Thick, Raw or Sharp (down, middle or up position).
Design choices were made to offer easier tweaking for those that already have the expertise and skillset to mod their circuits to their liking. All buffering and amplifying stages of the Bloodletter use conventional opamp topologies that are easy to work with.
Bloodletter uses W20K log-rev.log potentiometers which are widely available because of the popularity of the
Tube Screamer that utilizes this part in its Tone control. The log-rev.log W taper offers a sweep that's used in actual HM-2 pedals. This sweep is not achievable with more common linear, logarithmic or rev-logarithmic potentiometers. If W20K potentiometers are not available for you, linear or rev-logarithmic are recommended. If you care about noon setting being the “flat” setting go for linear or if you prefer a smoother sweep then go for rev-log. Resistance value should be as close as possible to the designed value 20k but anything between 10k and 50k will work.
There are small tonal differences between used op-amps in this circuit. TL074 is recommended for IC2 but LM324 can be worth experimenting with if you have the chance. TL074 gives a more clean response while LM324 is a bit more gnarly. There is no shortage of gnarly nevertheless.
Bloodletter is intended to be built into a 1590BB sized enclosure. It can fit either top jacks or side jacks. Use the standard center negative 9V power supply.
DIY PCB's are shipped as letter mail.
Use discount code ADDPCB to discount the PCB shipping off your order when buying a PCB simultaneously with a pedal.
All sales are final. No refunds.
