Electronic Keys and Locks Circuits-Digital Code Locks-Combination and Transistor Code Locks
Posted on Feb 7, 2014
Related Circuits
New Circuits
-
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.....
.
It can safely charge a 7-cell RC2000 pack in about 14 minutes, and an RC2400 or CP2400SCR pack in...
The signal emitted by an IR remote control contains two parts, the control pulses and a modulated...
U2 is a decade counter /divider, Ul is used as a switch debouncer. For a self-generating system,...
The circuit is based on the theory that insects like mosquito can be repelled by using sound...
Many electric cars are able to convert the momentum of the car into stored energy in batteries,...
This circuit produces a ringing sound similar to that made by more recent telephones. It consists...
The BU8872 and BU8872FS are DTMF receiver ICs developed for use in telephone answering machines,...
Colpitts oscillator. Its frequency depends on the capacitance of the vary cap diode. The center...
A simple passive (no power required) circuit to match an antenna to a radio receiver. This will...
Schematic shows R4 at the emmiter of the transistor, as amb and majkel have suggested it should...
This very simple circuit is an electronic thermometer using an inexpensive silicon transistor...
Automatic alarm circuit includes a DTMF Automatic dialing, password control circuit, voice...
characters left: