The circuit is based on a NE555 timer
IC (IC1) which is wires as an astable multivibrator to produce 1KHz
pulses. The output pulses of the IC1 will be amplified by the Q1(SK100)
to drive the two IR transmitter LEDs wired serially. The resistors R1,
R2 and capacitor C2 determines the operating frequency of the IC.The
circuit starts emitting IR pulses when ever the push button switch S1
is pressed.
Circuit diagram with Parts list.IC (IC1) which is wires as an astable multivibrator to produce 1KHz
pulses. The output pulses of the IC1 will be amplified by the Q1(SK100)
to drive the two IR transmitter LEDs wired serially. The resistors R1,
R2 and capacitor C2 determines the operating frequency of the IC.The
circuit starts emitting IR pulses when ever the push button switch S1
is pressed.
Notes.
- The circuit can be powered from a 9V PP3 battery.
- The switch S1 is a push button type switch.
- The IC 1 must be mounted on a holder.
- Basic Oscillator (Tone Generator) At 1.8 KHz -alarm circuits
