10 LEDS Audio level vumeter
Posted on Jul 5, 2012
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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 project takes advantage from -HOLD input, which is connected to push-button P1. As long as...
This is a circuit to use a standard, low quality opto isolator to transfer an analogue signal...
This flasher operates from a 12-volt car or boat battery. It offers 36 to 40-watts output,...
This waveshape generator is basically a slow running oscillator with variable attack and decay. A...
The HA2541 is well-suited for use as the heart of an oscillator. In spite of the rudimentary...
Electrical lines which include lighting circuits begin from the main distribution panel of the...
It can be adjusted to give the desired speed for the display. The output of the 555 is directly...
One type of regulator of tone / tone controls are the Audio Graphic Equalizer. Audio Graphic...
It is very convenient to light a lamp in our absense in the eving when it gets dark. This...
This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small...
At this circuit you can give a variety of utilities, from an alarm, to open a door, turn on a...
The oscillator circuits presented on this page are from expired or non-maintained U. S. Patents....
FGDF-3 three-phase low-temperature iron plating main circuit KGDF-3 low-temperature iron plating...
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