10 LEDs VU meter
Posted on Sep 8, 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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The switching power supply, shown in the schematic, provides 12 volts, at 10 amps, maximum, using...
This circuit features clipping indicators on the preamp and reverb recovery stages, allowing for...
As the circuit operates, the three sets of diodes with their isolation capacitors, build up an...
This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing a...
The turn-on and turn-off characteristics of two complementary transistors can be combined to...
The pulse repetition rate is selected by positioning SI to the desired position and the rate...
Sensing element Ql is a 2N3904 general-purpose npn transistor, although any general-purpose npn...
This is a mini FM transmitter built and powered using 2 transistors, designed by Tony van Roon....
This is a revised version of my LM35 based digital thermometer project that I posted last year....
It`s a simple metal detector design that has the quite good characteristics. the principle of...
Audio metering is present in almost any equipment that plays or records audio from cell phones...
A common NPN transistor can be turned into a negistor by wiring it in reverse. The emitter is...
The circuit featured here is very useful to save you from burning your tongue. The coffee...
Thomas Edison developed the incandescent light bulb, which operated from a 110 volt DC source....
Using a wire connection, use NFA.55 timebase circuit delay type light touch switch, it can...
Electronic ignition circuit for the water heater is shown. When you open the faucet, switch K 3V...
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