There is also be portions of the honey stick machine, including heaters and pump, that will need to be run on 120VAC and sill be switched on and off by the Phidgets interface. Relays would be the simplest option here, but again these mechanical relays have a far less than desirable rated lifespan in number of cycles. So I’ve opted to use solid state optically isolated AC relays. They typically have a far lower amperage rating, but I only expect to drive a maximum of 0.5 amps presently on any given AC device. The circuit pictured shows the very simply NPN driver circuit triggering an LED and the solid state relay.
Honey Stick Machine – Part 4c – AC Driver
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