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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Looks like the transmitter puts out light pulses and the IRX picks up those pulses,
the transistor gets a signal from IRX which then triggers the 555, the 555 then
pulses the CD4017, and that flips states to turn on the triac.
Energizing the transmitter a second time would flip the CD4017 the other way and
that would turn the triac off.
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