astable mode of 555 timer

The following schematic has been taken from buildcircuit. com. The following circuit can work as a music generator, Infrared transmitter and LED blinker depending upon the values of R1, R2 and C1. Making a minor modification in the previous circuit makes it work as an infrared transmitter. We can use this infrared transmitter for testing IR sensor

circuit and making an infrared based object counter. You can modify the circuit in the following way. Simply remove the LDR and add series of switches and resistors to make a simple organ. Click here to read more about this project.

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