Long-Interval Programmable Timer
Posted on Dec 20, 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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20W Bridge Audio Amplifier kit, based on the TDA2005 IC, a class B dual audio amplifier,...
Building a headphone amplifier is like building a power amp - only the current demand is just a...
This circuit will synthesize two rear channels for quadraphonic sound when fed with a stereo...
What that flip-flop does, but mostly why those two NAND gates aren`t just inverters. and why the...
The clock was experimental until I picked up some experience with the circuitry. I experimented...
This article describes the Gadgets Gizmos and Arduino (ATMega328). The content is very simple,...
This article by Arthur C. Miller was issued on page 88 to 90 in the book "Radio For The Millions"...
The metal detector circuit is composed of the probe oscillator, PLL phase-locked loop circuit and...
Quad comparators, type LM339. A flyback DC converter Done. Buck converter Step-up converter Done....
The receiver is built on a single-sided printed circuit board which measures 2 by 4. 3 inches....
Although this Power Supply was designed for the Modular Burglar Alarm - it has other...
Circuit works: This is an AC blown fuse alarm. When BX is not when blown, 220 V AC voltage...
A 555 four-base integrated circuit delay circuits They are a jump from high to low transition of...
As shown in FIG grounds TDA6103Q and color picture tube composed of the actual application. R,...
Cats are predators of rats, the use of electronic devices to simulate mew Repeller is an...
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