4 Digit Alarm Keypad
Posted on Apr 18, 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 circuit can be tuned to respond to signals between 50 MHz and 500 GHz. The economy model is...
Two gates of a 4011 arc used as a comparator. When the resistance of R4 decreases the voltage at...
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An efficiency of around 85 % and a power output of more than 200 watts is what you will get from...
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A basic detector radio set that uses a vacuum tube instead of a crystal detector. This radio...
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This article is about a simple 5 channel radio remote control circuit based on ICs TX-2B and...
This version of the Link is for those who really need a good cheap intercom that will work...
This article is of interest only to readers whose bicycle lights are powered by a dynamo. The...
Nothing in this project is real original, but I did do a couple of modifications from the...
The 100k potentiometers set the voltage level reaching the Op Amps. A dual ganged 100K-Ohm...
The older PC that concerned did have a standby state, but no matching BIOS set-ting that allows...
Circuit shown in Figure 3-108. SB3 for the forward button; S Island reverse button; SBi as low...
Circuit works as follows: The electrical circuit is a light, a light electric sound conversion...
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