Relay Bypass Module for Soft Touch Foot Switch (true bypass)

Regular price: $13.00
Sale price: $13.00
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Documentation

[PDF] True Bypass Relay Module documentation

Description

This is a true-bypass relay bypass kit for your DIY pedals. This is specifically to engage/bypass an effect. For general-purpose switching, see our other digital relay module instead.

This bypass board has loads of features:

Soft touch SPST foot switches are easier to use, less expensive, and more reliable than traditional latching 3PDT foot switches. You can even use buttons, temporary toggles, or any other momentary activator.
True bypass with a relay
Hold to temporarily engage the effect when bypassed, or to temporarily bypass when engaged. Or Quick tap to toggle.
Remembers whether your effect is bypassed or engaged, and next time you power up the pedal it will recall this setting. You can change to auto-on or auto-off by holding the switch while powering on.
Uses smart wear leveling to ensure the EEPROM stays in good health forever
Tiny size fits easily in a 1590A enclosure, or any nook and cranny you have. PCB measures 20x23mm.

Custom behavior is usually possible. Get in touch with your ideas. Or if you just need to use a normally closed foot switch instead of the default normally-open, leave a note at checkout.

Kit includes everything you need except the foot switch (normally-open, SPST):

Relay
PCB (20x23mm) with pre-soldered SMD components
Pre-programmed microcontroller

Older Versions

Documentation for all versions:

2.0 (current): https://mas-effects.com/relay.pdf
1.49: https://mas-effects.com/relay-1.49.pdf
1.4: https://mas-effects.com/relay-1.4.pdf
1.3: https://mas-effects.com/relay-1.3.pdf
1.2or earlier: https://mas-effects.com/relay-1.2.pdf

Optocoupler Notes

Older versions of this kit allowed for an optional TLP222G optocoupler which mutes the signal briefly while switching. However we're no longer carrying it because

1. It's rarely needed. It's meant as a last resort for people whose audio circuit has a popping noise when switching (unrelated to the relay, and it happens with a regular switch too), however that's not terribly common with most circuits. When it does happen, it's usually better and easier to fix the root cause of a pop than get the duration and timing of this muting behavior working correctly. You have a balancing act between suppressing the pop but AVOID a perceived delay in switching.

2. The part has been discontinued. We'll need to redesign the board to work with an alternate part, but it's not worthwhile because of (1) above.

HOWEVER... if you want to source your own optocoupler, contact us to see if we still have the old PCBs.

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