Programmable Timer For Long Intervals
Posted on Apr 26, 2012
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.....
.
This is my second-generation guitar reverb circuit. The fidelity is much improved over the...
The PIC16F870 chosen for this project has seval analog channels. One of these is used to...
A MW AM radio like those you buy, or used to buy. Use just BC549 trannies, with the BC559...
This circuit consists of twin-T sine-wave oscillators. Each oscillator has a filter in the...
IC1 contains several oscillators and an amplifier. The low-frequency audio-signal oscillator is...
A circuit that lets you operate your home appliances like lights and water pump from your office...
The intended result is that the relay oscillates and the LEDs flash when the button is pressed,...
This button, with a few hacks, now makes it so we can open up our office with our Nexus Ones,...
Here is the schematic from the Eico 667 tube tester. It is very similar to the 666, except now...
The capacitor C charges via R1 and R2 and when the voltage on the capacitor reaches 2/3 of the...
This wireless transmitter and receiver pair operate at 315Mhz. They can easily fit into a...
Circuits using large value resistor/capacitor combinations are not very accurate because of the...
The principle used in this electronic head or tail circuit is simple: a multivibrator controls a...
The MAX3420 is a USB peripheral controller chip with an SPI bus. This page hopefully contains...
Electric start and stop the timer circuit diagram shown in the following cycle, LM555 adjustable...
characters left: