According to kind of draw the circuit diagram shown in Figure 5, 220V AC power after the capacitor buck diode rectifier to lead-acid battery charging, the red LED for charging
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instructions. Close button switch K charged after use, first turn on three color flashing LED, issued fantastic vagaries of colorful light at night added some of the pleasures of life, and click the switch K is closed color flashing LED, then then only turned 24 in parallel with bright LED, due to the relatively large number of very good lighting effects. When the lead-acid battery voltage of 4V, lantern measured operating current of about 60mA, bright LED currents as high as 600 mA. Such a large current lighting not only makes each time not too long when fully charged, and the internal structure of the battery will damage and shorten life, it is necessary to highlight the LED string into a small value current limiting resistor, after repeated selected test circuit diagram omitted 1.2 eventually reduced operating current 320mA, and the brightness change is not obvious, because the modifications are minor lights which, after the transformation. Through the above analysis found that the market for sale a variety of LED lamp circuit mostly too simple, although the price is very cheap, but the objective will result in waste of energy, and only after some reasonable improvements to retain the advantages of both its economic and portable, and effectively improve the safety and reliability.
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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