Circuit as shown below, when the three-phase circuit in any one phase, star point balance is broken, small relay J is energized, an external control contact action, immediately
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cut off the main circuit AC contactor coil power supply, the motor phase protection. Components using 5mm bright white light-emitting diodes (or yellow-green and red, correspond exactly to ABC three-phase), 1N4001 silicon diode, 2W22k resistance, small relay option HH52P-L plug-driven or used for light 5A AC220V Chint JZX-22F. Adjusting resistor, the light-emitting diode forward current around 15mA, the forward voltage drop of about 3.5V, to normal light. The main thing is to meet the current small relay, generally between 10 ~ 20mA. When the three-phase circuit in any one phase, star point balance is broken, position to rise to 190V voltage zero zero point. The 0:00 is vacant, not in contact with any of the zero line. The 190V voltage is applied to both ends of a small relay J, pull-in voltage greater than the minimum, and the action, on top of a red light-emitting diode light itself. These small components, cheap. Between 0:00 and N points, or small relay J ends, you can also add a small buzzer, or through the contact leads, large external alarm. Sound, light, motion, three things at the same time the alarm.
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....
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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....
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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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