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CMOS Toggle Flip Flop: Laser Pointer Circuit Diagram
Description
The schematic below mirrors the previously presented design, yet it can be adapted to employ a laser pointer for activating the relay instead of a manual button. The infrared photo transistor, designated as Radio Shack 276-145A, or an equivalent, is connected to the control input (pin 6). This component should be protected from direct illumination to ensure the voltage at the control input (pin 6) remains below 1 volt under normal circumstances, escalating to over 10 volts when exposed to light from the laser pointer or another light source. A 4.7uF capacitor is utilized to establish a reset duration approximately 0.5 seconds, preventing the circuit from responding more than once within that interval. A 10K resistor and a diode create a quicker discharge pathway for the 4.7uF capacitor, allowing the circuit to be re-activated in under 1 second. The 3K resistor positioned in series with the photo transistor may require fine-tuning for optimal operation. The relay depicted is a solid-state type, suitable for usage with lights or other resistive loads up to 3 amps. A traditional mechanical relay can also be implemented as shown in the circuit above.
Circuit diagram
