MAXKING

Plug socket has embedded emergency lighting on the front of the socket. Low voltage, long-lasting, light-emitting diodes that will illuminate when the electrical supply to the socket is removed... The 1K resistor is put in the base to limit the current as too much base current can destroy the transistor. A resistor is often used in series with the base of a transistor to limit base current. Without limiting base current you run the risk of damaging your transistor. Normally you will see 1K in the base, with 5V this gives you a base current of 5mA (I=V/R), which given a gain of 100 will not saturate at collector currents of 500mA. We want the transistor to be saturated, (turned on). So only a few mA are needed to turn a transistor on, hence a resistor is put in the base to limit the current... Non maintained fittings will not illuminate unless there is a power cut, this is the emergency socket type we supply.

Also known as: LED Socket, Maxking Ltd

Primary location: United Kingdom