TRIAC SWITCH
Simple circuit to switch AC power to water solenoid values


This circuit provides optical isolation between a computer generated signal and AC powered solenoids. The component values were determined by trial and error off a reference design provided in the MOC3023 datasheet.

NOTES:
  1. Current leakage when the triac is off was measured at 0.9mA

  2. Suggested resistor value to step down a 5 volt signal to the required 1.4 volt is 715 ohm

CIRCUIT:

Optically isolated triac switch cicuit to control water solenoid values for a lawn water sprinkler system

PARTS LIST:

  1. MOC3023 -- opto-coupler

  2. BT136-600D triac

  3. 360 ohm resistor

  4. 2.4k ohm resistor

  5. 0.01 uF ceramic capacitor

  6. 24 volt water solenoid valve

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