5 to 30 Minute Timer
Posted on May 15, 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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The IRF820 MOSFET has a voltage rating of 500v, it should work well in preamp stages of most tube...
This circuit operates like the one shown in Fig, 57-4, The only differences are that the field is...
This linear post regulator provides 12 V at 3 A. It employs TL431 reference Ul which, without...
This circuit is a wireless car alarm system that is built using two circuit modules, namely...
Audio amplifier circuit is very suitable for use at home, using a subwoofer speaker, or woofer...
This is a chronological account of a project I am working on: to design and build my own digital...
This disco lamp circuit is not a voice operated switch (VOX) because this circuit is too dumb to...
In this auto shut off tone generator project, once the switch to the 9V power supply is...
Water tank overflow liquid level sensor alarm circuit is a simple electronics project for school...
A series resistor, and a bypass capacitor along with a zener in parallel with the hall sensor to...
Time would be much better spent on explaining transistor and MOSFET behaviour in a simpler way...
3 feet from the oscillating pulse output 555 of 40kHz drive T-40-16 work, so that emit ultrasonic...
Electric water heater temperature control circuit, with water level indication, temperature and...
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