Build a Beeper visual indicator

Posted on Feb 4, 2014

This entire circuit of beeper cum visual indicator is build and fabricated around two timer ICs and is configured in an astable multivibrator mode. The frequency generated by IC1 is controlled by capacitor C1. The output from pin 3 of IC1 is given to input pin 4 of IC2 and base of voltage amplifier transistor T1 through resistor R4. Flashing light

Build a Beeper visual indicator
Click here to download the full size of the above Circuit.

is connected to collector of switching transistor T2 and grounded through resistor R7.

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fine   Apr 9, 2018

y the transistor is known as voltage amplifier?? doesnt it act as a switch?? then y the other transisitor is known as power transistor?

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