This circuit is IC controlled emergency light. This series of automatic switching-on of the sunshine on mains failure and battery charger with overcharge protection. When mains is absent, the relay RL2 is in deenergised state, feeding battery offer to the inverter section via its N / C contacts and switch S1. The inverter section contains IC2 (NE5
Click here to download the full size of the above Circuit.
55) that is used in a very stable fashion to supply sharp pulses at the rate of 50 Hz for driving the MOSFETs. The output of IC3 is fed to the gate of MOSFET (T4) directly whereas it`s applied to MOSFET (T3) when inversion by gate transistor T2. so the facility amplifier designed around MOSFETs T3 and T4 functions in push-pull mode. The output across the secondary of transformer X2 can easily drive a 230-volt, 20-watt fluorescent tube. In case light is not needed to be on throughout mains failure, simply flip the switch S1 to off position. Battery overcharge preventer circuit is constructed around IC1 (LM308). Its non-inverting pin is held at a reference voltage of approximately 6. 9 volts that is obtained using diode D5 (1N4148) and 6. 2-volt zener D6. The inverting pin of IC1 is connected to the positive terminal of battery. so when mains offer is gift, Comparator IC1 output is high, unless battery voltage exceeds 6. 9 volts. therefore the transistor T1 is generally forward biased, that energises relay RL1. in this state the battery remains on charge via the N / O contacts of relays RL1 and current limiting resistor R2. When battery voltage exceeds 6. 9 volts (overcharged condition), IC1 output goes low and gets deenergised relay RL1, and so stops more charging of battery. MOSFETs T3 and T4 may be mounted on suitable heat sinks.
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.....
characters left: