Count Down Timer Relay with 555
Posted on Sep 11, 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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I made this project as a test to improve a technic to read analog values without...
This 1-cable system carries composite video (NTSC, PAL, or SECAM), power, and channelselect...
A 2uF capacitor is charged to regarding 340 volts and also the discharge is controlled by an SCR....
In case the robot being on the black line, it will always go ahead, and in the case of out of...
Atmega 8535 Color Conversion to Frequency, the technology of instrumentation that can recognize...
A class-A audio amplifier is pretty wasteful of power but when plenty of power is available the...
This simple mosfet power audio amplifier circuit, with TL071C and 2 mosfet power amplifiers can...
Before you begin a project like this remember: mains voltage is dangerous so if you are not 100%...
The E1T tube you see on the left has been "in the family" for as long as I can remember. Probably...
The circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an...
With the impending close down of the 405-line transmitter network those of us with collections of...
Automatic Humidifier can be used to control humidity control family, it can also be used...
Click the button switch Sl-Sn, lights that light, the power is turned on while the transformer...
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