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

1.3W RF Amplifier Circuit
avr Piezoelectric Sensor and the ADC
misc
Brightness controller for low power lamps
Long duration timer circuit
10 Hz to 10 Khz Voltage Controlled Oscillator
TDA4863AJ Basic Application Circuit a
Voice lamp FC52 schematic



Top