This original design uses common off the shelf components, including a 5-volt Panasonic relay (so it’s cheap and a snap to assemble) and requires no programing. The novelty for me lies in its topological similarity to a push-pull tube amplifier.
http://www.edn.com/article/511563-CMOS_circuit_latches_relays.php
This multi-purpose circuit can be used to provide soft heel-switching of WAH and WAH-VIBE pedals, for example, all the way up to complex foot-switch based routers and remote stage controllers.
The hunt is on for low draw op-amps that will work here, as it stands the 5532 draws 6mA while the logic circuit only draws 2mA.
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