Zero Crossing Detector via H11AA1 Opto

296

03:02:54

Circuit from www.bristolwatch.com - Arduino based lamp dimmer.  Quite elegant

published 8 years ago

billoute720

8 years ago

What is the utility of capacitors ?

tjt263

7 years ago

This doesn't make sense. Are the LEDs supposed to light up? How do you adjust the intensity?

dickieboy

6 years ago

An old circuit revisited for fun, my own entertainment. From memory and perhaps not accurate, it's purpose as a zero crossing detector provided power line frequency reference for smooth dimming in three phase incandescent lighting systems on giant gondola wheels - that have all been LED replaced. The two LEDs are back to back inside a H11AA1 opto isolator IC also not seen much anymore. Have fun!

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