Dual-tone car horn


Posted on May 17, 2012

An LM556 dual oscillator/timer, U1, configured as a two-tone oscillator drives U2, a dual 4-watt amplifier. One of the oscillators, pins 1 to 6, contained in U1 produces the upper frequency signal of about 200 Hz, while the second oscillator, pins 8 to 13, provides the lower frequency signal of about 140Hz.


Dual-tone car horn
Click here to download the full size of the above Circuit.

Increase or decrease the frequencies by changing the values of C2 and C3. U1's outputs, pins 9 and 5, are connected to separate potentiometers to provide control over volume and balance. Each half of U2 produces 4W of audio that is delivered to two 8 ohms




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Subwoofer Amplifier Circuit
Electronic Doorbell Circuit
Amp Compensation
211 SET amp built
LM386 Audio Amplifier Circuit
555 Touch Sensor Switch Circuit
4 Band Double Tuned Preselector
Guitar Effects & JFET Splitter



Top