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Circuits > Motor, light and power control > Light Activated Relay
Light Activated Relay
This 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: 509
Print version: 
Circuits > Motor, light and power control > Light Activated Relay |
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