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Sounds train whistle with ic 556

When pressed Sw1 will train noise emitted through the speakers. Created for use as sound alarms and other.Using the IC 556 is a great circuit.
This circuit features a small. Because it uses a single IC. Working out sound speakers directly.
Operation of the circuit.When connecting the power supply.Low frequency generator circuit to start out the 5th pin. A separate section to the 9 pin. To the speaker driver.Frequency depends on the R2, C2.The signal from the 5 pin is connected to the 8 pin.The R6, C1 to reset the circuit delay.
When the reset pin 8 signal. High frequency signal generators will come out at pin 9 of IC1. So frequencies that are characteristic of sound, low frequency. Then a high frequency.

Be the first to comment - What do you think? Posted by admin - September 22, 2010 at 8:10 am

Categories: Alarm systems Tags: audio generator circuit, NE556, Sound Alarm Generator

Electronic car horn by NE556

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.
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 loudspeakers via capacitors C7 and C8.

Read Source:http://www.circuitsuggest.com/electronic-car-horn.html

Be the first to comment - What do you think? Posted by admin - June 10, 2009 at 8:28 am

Categories: Audio diagram, Automotive Tags: car alarm systems, NE556, tone audio generator

Home burglar alarm with timer delay using one IC 556

This circuit uses IC 556 which have timer 2 the group in one. First group is moto stable and second group does in front is in a state of a signal goes out work to is unfinished although signal. From detect disappear already. But output a pin 9 still have voltage the tall when encourage from detect , which might be switch the door is model usual close the circuit, or be strip sticks at sheet window glass by detect every jigsaw serial puzzle all. When detect any one open the circuit. The circuit will encourage signal to warn immediately and will work unfinished through the fire until press S1 for reset give the circuit stops to work. When feed power supply the circuit will still don’t work immediately, Because motostable delay keep 22 S. For S2 be switch at for stop the work of by don’t discharge power supply go out.