Precision time-countdown timer
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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If this picture (above) looks a lot like the Pretty Good LC Meter also on this web site, that's...
The CDI ignition circuit produces a spark from an ignition coil by discharging a capacitor across...
You`ve probably heard about the CP210x USB ICs from Silicon Labs, now here`s an application that...
Edwin Henry Colpitts was a communications pioneer best known for his invention of the Colpitts...
For the other components you should have most of the stuff lying around if you have doneany type...
Most of us take the mains ac supply for granted and use it almost casually without giving the...
A Variable DC Power Supply is one of the most useful tools on the electronics hobbyist`s...
This interface became a standard to almost all operating systems we know today. IDEfile is a...
A long time ago when telephones were so simple almost nothing could go amiss from an electrical...
Control pulses transmitted in blanking interval by tv network transmitter are decoded by receiver...
Circuit works: lC is a 555 IC. Incoming calls, 220 V electricity through R1 Buck, VD1 rectifier,...
2W resistors can be used around a metal or carbon film resistors fortunate optional paper...
This transmitter of 255W is depended on the coils we put at it to work in both the middle and the...
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