Audio band-pass filter
Posted on Mar 28, 2007
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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This circuit operates by charging a small capacitor from a constant-current source when the pulse...
There is something to be said for the processes of reducing a set of objects or functions down to...
The TPS61200 spec says GND is control/logic ground and PGND is power ground but this isn`t...
The concept is that a pair of yellow LEDs are placed in an otherwise inconspicuous pumpkin, and a...
This jet engine sound generator circuit is based on the sound generator IC HT2844P from Holtek...
This project describes a digital clock with alarm function. It uses a PIC16F877 microcontroller...
The latest addition to my collection of Infra Red (IR) Repeater circuits. The Mark 5 is a much...
The microcontroller (MCU) is responsible for sending variable voltages over time (just like a...
As it is well known, according to power saving regulations, we need to obtain a very low power...
This smoke detector circuit diagram is based on the SD2 CMOS Photo-Electric Smoke Detector...
The key you`ve connected to "E" is used to energize the relay. And the four keys you`ve connected...
The above shows my home-built digital clock. It uses Nixie-tubes for readout. In contrast to most...
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