Smartcard controlled Lock with Relay
Posted on Jul 26, 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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This little circuit can be used to dim lights up to about 350 watts. It uses a simple, standard...
The uWatch comes as a kit of parts. All of the electronic SMD parts on the PCB are pre-assembled....
This electronic project stereo amp is based on the STK415-090-E class H audio power amplifier...
This probe is useful for any low level RF work, and simply connects to your multimeter. The...
This de adapter provides a regulated 9-V source for operating a Kenwood TR-2500 hand-held...
A transverter on a range of 70 MHz. With access to the transceiver KENWOOD TR-751A (144 - 146...
For the other components you should have most of the stuff lying around if you have doneany type...
This simple amplifier is ideal for adding a headphone jack to equipment that lacks this feature....
The transmitter part of the circuit is build around IC1(NE 555). The IC1 is wired as an astable...
NJM2268 is a dual Video 6dB Amplifier with 75 drivers for S-VHS VCRsHI-BAND VCRsetc. One channel...
The voltage range will be 0V to 24V and I don`t expect to use any more than 4A. A micro and LCD...
A very simple FM transmitter circuit can be designed using MC2833 integrated circuit, designed...
This is a simple and inexpensive clap operated switch, which uses only four transistors and...
Bridge sensor output signal precision differential instrumentation amplifier with adjustable...
Dctl is a two-stage amplifier, the first stage amplifying transistor VT1 collector voltage U
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