Digital code Lock with AT89C2051
Posted on Jan 10, 2013
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 relatively simple mixer was designed for three dynamic microphones, but can be re-designed...
The 040904C version of the code has a larger UART receive buffer and supports two pushbuttons...
Initially the neon and xenon lamps are not conducting and act like a very high (almost infinite)...
A voltage divider consisting of Rl, R2, and R3 is used to set the input reference voltage below...
The output frequency from IC pin 3 is determined by the voltage input to pin 6. A standard...
This is a circuit for oscillator using astable mode operation. The basic oscillatior is using 555...
This is the 40Mhz RF amplifier circuit. The sensitivity of a receiver may be significantly...
Video signals can be difficult to display on an oscilloscope. Normal trigger circuits in most...
A circuit that can detect a light beam cut. The first circuit i made was a light/dark detector...
The schematic for this project isn`t too, too bad to look at even though it`s not the best...
(1) using thyristor incandescent dimming circuit one circuit is shown in Figure 2-66. Figure 2-66...
As shown in FIG grounds PGA203 and isolation amplifier IS0102 constitute isolated programmable...
Development and production of special touch dimmer integrated circuit, it has a dark, medium,...
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