Thursday, January 20, 2011

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Simple Doorbell Circuit Using LF351 Op-Amp

This is a electronic doorbell circuit schematic has a very simple function and is very easy to build. This door bell circuit use a LF351 operational amplifier and other few common electronic components . When the S1 push-button is depressed an initial positive voltage is placed on the C2 and the non-inverting terminal of the LF351 operational amplifier and the circuit will oscillate at a low frequency .
Dor Bell Circuit Using  LF351 Op-Amp
 LF351 Pinout
The used speaker for this project must have a impedance between 40 -80 ohms . The door buzzer electronic circuit need to be powered using a 9 volts DC power supply .

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