Variable Bandpass Audio Filter Circuit
Posted on Jan 4, 2013
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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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This is a computer I built for my car, its an MP3 music system but can also do other tasks. Based...
Q1 & Q2 provide linear frequency operation of IC1 following P1 resistance variation. Q3 was...
Using this low cost Project one can reproduce AUDIO from TV without disturbing anyone. It does...
This circuit was used to trip a camera shutter. Grounding pin 2 of U1 makes pin 4 of U1 go high....
Add to our circuit despreading spectrum 2 identical branches more. Difference is only in phase of...
This project involves constructing an energy efficient broad spectrum LED lamp system. The lamp...
The Clapp oscillator is one of several types of electronic oscillator constructed from a...
Most Atmel AVR microcontrollers can be programmed via their in-built serial programming...
The 2 X16 Parallel LCD is an 8 bit or 4 bit parallel interfaced LCD. This unit allows the user to...
The circuit of active shortwave antenna presented here boosts weak shortwave signals so that...
The circuit timer with musical alarm use famous CMOS oscillator/divider IC (IC1 ). Although this...
Control a car toy. The toy car is controlled via a controller that is connected to it via a wire,...
Colour Temperature is a term used to describe the colour tonality or shade of light. As anyone...
AD7s23 is an 8-bit multiplication DA converter, the output voltage of the analog input and the...
DC-coupled single-tube amplifier (l) single-tube coupling the DC amplifier so-called single-tube...
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in3elx Jun 2, 2020