Choke circuit to run broken filament 40Watt tubelights

This simplest electronic choke can be built low cost, it can glow open tubelights too, no need of a new . Working voltage: 170~300V for 220V tube, 80~140V for 110V tube. You can use a tungsten bulb of 100Watt rating of 230V/110V as the series inductor, U can use Existing Choke, or use fan regulator coil, or even Soldering Iron coil(min65W). For the diodes, IN4007 has reverse voltage protection...

Read More

Mosquito Racket Repairing Diagram (Made By China)

There are these types of mosquito killer racket are easily available in market at some 150 rupees.Mosquito Killer racket .This consist an electric fence in the bat portion which has 5000-10,000 volts passing through them. This is not only mosquito repellent, it’s insect zapper. When a mosquito gets in contact the high voltage  burns it. The inner circuit consists of battery, a charging unit,...

Read More

Automatic LED Emergency Light

To understand the above circuit in a better way, it can be divided into two parts. 1. LED lamp circuit 2. The Battery charger circuit LED Lamp circuit :  All are white hi bright LEDs rated for 3Volt @ 25mA The total current requirement is 12 X 25 = 300mA This current has to flow through T2 – BD140 PNP transistor The minimum current gain (hfe) of this transistor @ 500mA is 50  Hence...

Read More

Cable TV amplifier

Description : This is a very simple cable TV amplifier using two transistors. This amplifier circuit is most suitable for cable TV systems using 75 Ohm coaxial cables and works fine up to 150MHz. Transistor T1 performs the job of amplification. Up to 20dB gain can be expected from the circuit.T2 is wired as an emitter follower to increase current gain. TV Amplifier Active Components : T1,...

Read More