Sound activated relay
Posted on May 15, 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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20W Bridge Audio Amplifier kit, based on the TDA2005 IC, a class B dual audio amplifier,...
This simple AM circuit uses a 561B. There's no inductance/capacitance tuning circuit. The 365 pF...
Transistors Q1 and Q2 amplify the incoming signal, and the gain is such that the input will...
Most of the transistors in this speaker protector function as switches. Normally, Q4, Q5, and K1...
This circuit will generate an ear-splitting 110 dB from 9 V. The setup uses a single 74C14...
This report describes the operation and adjustment of a Phase Locked Loop hum cancellation...
Understand how come the LED will not light up as the Capacitor looks like it`s by-passing the...
This circuit is use to Digital Radar Speedometer. It allows us to evaluate the speed of any...
This 2 channels audio mixer is based on the 2n3904 transistors which forms 2 preamplifiers. The...
This is a simple and easy to build multi tone alarm circuit that can be used in burglar alarms or...
Miniature vacuum tubes with cathodes of high-field-emitting carbon nanotubes are currently under...
This application note describes a driver solution developed using the Zetex ZXLD1362 LED Driver...
Consumer appliances these days hardly ever have a proper mains switch. Instead, appliances are...
A very simple active antenna can be designed using this electronic circuit diagram. This active...
Good pitching beats good hitting and a good magnetic mic beats a good carbon mic. This one...
A 12 Volt high current 20 Amp power supply. The output voltage is variable from 12. 2 Volt to 14....
Constitute a CMOS circuit time adjustment of a spot welder The number of cycles it uses CMOS...
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