power supply alarm circuit
Posted on Mar 21, 2013
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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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This project arises from the need to home-build a valid tuning control for a multi band...
This is a simple LED circuit that takes power from the USB port. I needed this USB light since...
Integrated-circuit Ul—an LF351 or 741 op amp—is used as a comparator to control the light....
This unit uses switches and resistors to provide a number of current ranges. It allows you to...
The basis for this amplifier is published as Project 03, and makes no claim to be state of the...
The joule thief is an electronic circuit that allows you to make use of batteries normally...
This type of voltmeter is very common because of its low cost. This instrument can be used only...
The above circuit is recommended for use in SSTV applications with use of the sound card with a...
The plumbing is done and the fuel system is done. Final checks on the electrical system are under...
As shown is a 12V constant voltage charger. The power supply circuit with the same basic...
Circuit shown in Figure 3-92. It uses dual-phase sequence protection relay sense. When the power...
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