24-bit parallel port interface with 8255
Posted on Oct 8, 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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This simple circuit will energize and de-energize a relay at the push of a button. Any type of...
The clock circuit above uses seven ICs and 19 LEDs to indicate binary coded decimal time. The...
The detector circuit is made up a two-amplifier multiple feedback bandpass filter followed by an...
A pair of timer IC"s are the heart of a circuit that simulates the warbling bee-haw of a British...
The power line fluctuations and cut-offs cause damages to electrical appliances connected to the...
This circuit not only indicates the amount of water present in the overhead tank but also gives...
The chief advantage of this programmer is its ability to protect both the target and the PC from...
The key point is that there is no iteration as is usually done. All alignment methods I have seen...
With this circuit you can can check that which dot of the circuit is Positive Volt or Negative...
It can detect what`s being typed on it. It can be used to send text to and/or receive text from a...
A total of six buffer circuits (using three dual op-amp packages), five for the input channels...
This cable tv amplifier circuit is a rf amplifier designed to be quickly installed between two...
I am posting here a circuit example for interfacing RF module using HT12E/D encoder decoder pair....
Can be used for Touch-Tone decoding as well as for telephone-line and wireless control...
This circuit must be connected before the amplifier circuit. For maximum performance, you may use...
Peak voltage sample and hold circuit: peak voltage sample and hold circuit is shown in Figure...
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alimhmd Feb 29, 2008