Electronic Door Buzzer

Posted on Oct 25, 2012

When SI is depressed, an initial positive voltage is placed on C2 and the noninverting terminal of Ul. The circuit o

Electronic Door Buzzer
Click here to download the full size of the above Circuit.

scillates at a low frequency. As C2 charges up through R3, a rapid increase in frequency of oscillation results, producing (at SPKR1) a rapidly rising pitched sound. This sound is easily recognized over ambient noise.

Leave Comment

characters left:

New Circuits



Popular Circuits

Simple Digital Potentiometer with DS1869
Audio oscillator
Schematic Audio Power Amplifier with IC TDA2612 Schematic Diagram
Measure your stress level Tension meter Schematic Diagram
Motor driver L298 Circuit Schematic Diagram
sd card logging
digital clock and temperature block
15 volts power supply electronic circuit project using LT3512
TDA7000 fm radio integrated circuit design