Automatic Turn-Off Alarm With Delay
Posted on Apr 6, 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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An RF isolator is a seemingly magic device that allows signals to pass in only one direction....
A simple count-down LED timer that counts in minutes and seconds. Three buttons below the LED...
This Intercom is powered by two 9volt batteries and uses only current when the Intercom is used....
This circuit converts a tape recorder into a completely automatic telephone conversation...
Section Ul-a is configured as a high-gain inverting voltage amplifier that is inductively...
This is just my attempt in making the simplest and kinda smallest photovore. Well, it`s not that...
We have modified the schematic diagram above with the addition of a 220uF smoothing capacitor...
Flight Computer V1. 0: B1 PC Board U1 80C32 microprocessor U2 27C256-12 32Kx8 ROM - 120nS U3...
The device uses a microammeter with full scale deflection of 50 uA and with the resistance of 2...
As ZKJ-S-type buffer controller circuit for motor starting slip control. Buffer controller by the...
This transmitter works in the short waves from 6MC / S to 22MC / S. Coil L1 is the short wave...
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