Dual-tone car horn
Posted on May 17, 2012
New Circuits
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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.... -
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.... -
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.... -
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.... -
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.... -
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,.... -
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.... -
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.... -
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.....
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Here's something that has always bugged me: light waves are about 5000 Angstroms in wavelength,...
Building a foxhole radio is rewarding and the basic setup is very simple. It is, however,...
Outputs from each channel are fed to the two inputs of ICl connected as a differential amplifier....
A transducer senses a direct current magnetically, providing isolation between the input and the...
This circuit detects the 20 Hz, "" 86-V rms ring signal on telephone lines and initiates action...
Using this circuit you can convert the 12V dc in to the 220V Ac. In this circuit 4047 is use to...
The above circuit will charge any 2-cell * Li-Ion battery pack. Maximum current is about 650...
This circuit is a circuit diagram of resource replacement 1. 3V mercury cells or other small...
My vintage (62 year old) pole light has always been controlled by a timer ”a source of continual...
This circuit lets an external 12V SLA battery power a camcorder which normally has an inbuilt 7....
The purpose of this project was to develop a stepper motor driver for 2-phase unipolar stepper...
Build a 10W LED flashlight that features swappable UV/IR/visible heads. We decided to document...
The dc output of the voltage multiplier ranges from 1000 volts to 30, 000 volts. The actual...
As shown for the voltage-controlled gain amplifier. Use FET gate voltage and the drain - source...
As shown in the figure shows the actual application circuit TDA8351/8356, when the 50V VFB 60V,...
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