Wireless Lock Tone

Posted on Feb 6, 2014

When I got the car I was relieved that it didn`t `chirp` or blare the horn every time I locked or unlocked the doors. Let`s face it, there are times when we don`t want our comings and goings announced in such a tactless manner. Still, I found that in the daytime, when walking away from the car, or after forgetting until I`m some distance away, I c

Click here to download the full size of the above Circuit.

ould not tell if the car was locking or unlocking. I found on the crossfireforum. org website an idea to install a device that gives out a gentle tone that can be heard from a short distance and does not announce the locking or unlocking like the opening of a Broadway musical. The circuit I designed has a single-pole, double throw push-button switch. In one position, the buzzer in the circuit quietly beeps. In the other position, the lamp in the circuit flashes. The reason for the lamp is to provide a diagnostic function to aid in troubleshooting if problems develop. I mainly put the switch in to provide an easy way to disable the beeping sound if for some reason I didn`t want it to operate. I removed the relay and wrapped the wires around the 85 terminal (positive) and 86 terminal (negative). After shaping the wires, I removed them and put some solder on them to help them keep their shape. Then I replaced the wires on their respective terminals, and reinstalled the relay in its socket. Here is a view of the wiring coming from the relay in the upper right corner of the picture. Black is ground and white is positive. Note the thicker red wire coming off the fuse bank. This is the switched positive lead that goes to the auxiliary fuse box I assembled and installed in support of my stereo install. I took this opportunity to route the red stereo wire and the leads for the buzzer through a rubber port provided for this purpose....

Visit page

Leave Comment

characters left:

Related Circuits

Ultrasonic sound producer(insect repellent)

As we know many kinds of insects have their tendency to hear ultrasonic sound(which cause them irritation), this project is very useful to swept away those insects like mosquito cockroach etc.

PIC 18 Explorer Board LCD Example Code With SPI Library

Learn to use the LCD display on your pic 18 explorer board with the spi library. The spi library will be used to easily display characters on the LCD. You will also learn how io expanders work.

cellphone operated land rover

I know the general rule of world that reading makes man ready, writing makes man everyday but practice makes man perfect. Only theoretical knowledge is not enough for an E. C (Electronics and...

RC5 Protocol Decoding with 8051

Infrared light is electromagnetic radiation with longer wavelengths than those of visible light. Infrared light is used in industrial, scientific, and medical applications. Most of the remote...

Digital Clock Using Microcontroller 89C52/89S52

Are you a beginner in micro controller projects and are you stuck where to start from if yes, then this is one of the simplest mini projects that you can start from. This mini project will give you...

Password(code) Based Digital Locking System Using Microcontroller 89C52/89S52

entering of the password, the application as in this case "led" will glow. In this Digital locking system project you will learn more about interfacing keypad and 16x2 LCD to your micro controller...

Shifter(Bit Shifter) in Computers and its

EL Lamp Driver Using HV832MG

An EL lamp is a solid state, low power, uniform area light source. Because of its thin pro ¬le (as thin as 0. 3 mm) and the fact that it can be built into almost any size and shape, EL lamps are...

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
Ultrasonic distance finder circuit

The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Simple Metal detector circuit with CD4030

Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Fully automatic watering circuit for flower pots

Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
Simple deep searching metal detector circuit

The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
Sub-Harmonic Bass Converter for Electric Guitars

The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
Echo Depth Sounding Sonar for Boats

In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
100W HiFi Audio Amplifier Circuit

This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
Plant-Pot Water Level Indicator Circuit

A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....

Create NOW your QR MENU for your Restaurant / Hotel / Bar / Caffe,

Comprehensive ordering/paying features. fully personalized to suit your Business.

Update Anytime! Easy and Simple!

Popular Circuits

DMM-ProfiLab 4.0

The DMM-ProfiLab-Software allows you to develop any measuring technology projects based upon...

Waveform Capture and Control

The result was a project that includes a waveform capture circuit, a graphic LCD (Liquid Crystal...

ASCII Programmer PIC16F84

The idea behind this project is to provide some means of loading a program into a PIC that will...

Computer-speech-synthesizer

This text-to-speech converter is built around the SP0256-AL2 speech processor and the Cf6256AL2...

10 Minute timer circuit

When ever you need to get an alarm or intimation after ten minutes, the circuit shown below can...

High voltage (120V), converting familiar fast (120V Shu us) power MOSFET Amplifier circuit

The south circuit composed of four parts, the order of descent {NPN transistor whole dynamic...

Bridge motor drive circuit

Bridge motor drive circuit Bridge motor drive circuit is shown, the driving stage of the circuit...

Ratio discriminator circuit

Common phase frequency detector can be divided into mutual coupling and capacitive coupling...