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.
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.
The circuit is not in this thread.
A triac is used in an AC light dimmer. It turns itself off each half-cycle so it needs to be turned on again over and over if you want lights to remain on.
An SCR is half-wave so it lights light bulbs dimmly with AC. It turns itself off each cycle so it also needs to be turned on again over and over if you want lights to remain on.
An SCR is used in a DC alarm system. It stays turned on after it is triggered for a moment.
Transistoirs or Mosfets turn on DC traffic lights and are driven by a sequencer circuit.
A CD4017 is a sequencer circuit. It has one output go high one after the other.
A traffic light is driven by a sequencer circuit because the colours light one after the other in a sequence.
A CD4017 is a sequencer circuit. It has one output go high one after the other.
A traffic light is driven by a sequencer circuit because the colours light one after the other in a sequence.
The project is used for toys. The diodes form OR gates so the green LED is turned on for twice as long as the amber LED. The amber LED is turned on for only two clock periods.
If it used SCRs then the lights would be on all the time (unless you short the SCR to turn it off).
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
