Sensor-Activated Relay Pulser Circuit

A sensor turns on Ql to activate the low-frequency 555 oscillator, which pulses LAMP II. Sensor may be sensitive to changes in light or temperature. Either RA or RB can be sensors, as desired. A decrease in RB or an increase in RA will cause the NE555 to flash M.

fl and RB should be 100 kohm max.

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