Position: Index > Unclassified >

Back-up-beeper

2017-09-11 01:26  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.


Put the car in reverse and the circuit provides a loud, audible beep at the rate of about one per second (1Hz). Half of U1, a 556 dual oscillator/timer, is used as a slow-pulse oscillator with a rate of about 1Hz. Components R2, R1, and C1 form the long time constant. You can calculate on time by t~.7 (R1 R2) C1 or 1.15 seconds. The off time is shorter than the on time, at . 77 second. Enabling pin 4 (reset) is held high to keep the oscillator freerunning when voltage is applied to pin 14.
Back-up-beeper

The output at pin 5 is coupled to pin 10 of U1 enabling oscillator 2. Oscillator 2 of U1 produces an audio output of about 1 kHz, as determined by C2, R3, and R4. Pin 10 (reset) of oscillator 2 is connected to the pin 5 output of oscillator 1. Sn when pin 5 becomes positive, the oscillator beeps a short pulsed tone of 1 kHz.



Reprinted Url Of This Article:
http://www.next.gr/audio/beeper-buzzer/back-up-beeper-l13155.html