Schematics > Motor, light and power control > Light Activated Relay
Light Activated RelayThis is same circuit as above with the addition of a photo resistor to
trigger the flip flop instead of a push button. The bias resistor in series with
photo resistor was chosen so that sufficient voltage is present at the base of
the 2N3904 to supply current to the circuit in ambient lighting conditions. The
circuit should toggle when the photo resistor is hit by a flashlight beam or
other fast changing light source. Slow changes in light intensity will have no
effect unless the light gets too bright to maintain sufficient bias for the
2N3904.
Light Activated Relay circuit
Title: Light Activated Relay
Source: unknown
Published on: 2007-07-21
Reads: 352
Print version:  Other schematics from Motor, light and power control
Automatic Dual output Display Light Flasher Touch Activated Light 220 Volts Flashing Lamps Fading LEDs Discrete component motor direction controller Flashing Neons (NE-2 / NE-51) Knightrider lights for model cars 60 Light Sequencer using a Matrix Simple DC motor PWN speed control
Schematics > Motor, light and power control > Light Activated Relay | 
Home
