4 switch combination Combination Lock
Posted on Dec 13, 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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There are a number of ways to obtain the low voltages required to run small projects from the...
Power op amps provide accurate speed control for dc motors. The circuit provides bidirectional...
The following diagram is the 50W offline switching power supply circuit design. The circuit...
Charge a simple servo that only has + and - pins. Usually I would connect it`s - pin to the...
This battery-powered monitor has been designed to provide an audible indication of keying for...
This project started because I wanted a Li-ion charging circuit with more flexibility than...
Here is the 22 watt stereo audio power amplifier circuit diagram based on TDA1554 and integrated...
This data sheet describes the evaluation board for the AD9834 direct digital synthesizer (DDS)....
A sensor project which transmits it`s measurements via a 433Mhz wireless communication link. On...
The next job is the LNA transistor replacement, but the trouble is repeated already within next...
This project was used to introduce a friend of mine to microcontrollers and circuits. I wanted...
Circuit operation principle of the device shown in Figure. Usually infrared light emitting tube...
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