This Timer can give a time delay from 10 minutes to 12 hours. The time delay can be selected using a Rotary switch and when the timing cycle completes, relay energizes and remains latched till the circuit resets. This circuit finds various applications like battery charging or to control lab equipments. Timing cycle is not so precise and a variati
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on of one to 3 minutes can be expected. Main element of the circuit is the popular Binary counter IC CD4060. It is the 14 stage Oscillator cum binary counter cum frequency divider with an inbuilt oscillator which oscillate depending on the values of the resistor connected to its pin 10 and capacitor at pin 9. When the timing cycles completes, output of the IC goes high. This output can be used to drive loads such as relay through a driver transistor. Since IC 4060 is a binary counter, each output turns high with a time delay double that of the previous one and remains high for the same duration. So any of the 10 outputs can be used to get the required time delay. Output Q 10 is omitted in the IC itself so that the time delay of Q11 (Pin 1) output is 4 times higher than that of Q9 (Pin 15). At power on IC1 resets through C1 and R2 and starts oscillations. Q3 output (Pin7) turns high first which is indicated by the blinking of Green LED. Each output then turns high as follows: When the output turns high, transistor T1 conducts and activates the relay. Load can be connected through the Common and NC contacts of the relay so that when the relay turns on, load disconnects. Red LED indicates the activation of relay. When the output turns high, diode D2 conducts and inhibits the oscillator and IC1 latches with the high output and the relay remains energized till resetting. Push switch can be used to reset IC1 if required. Circuit...
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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