simple emergency led light circuit


Posted on Feb 6, 2014

This emergency LED light is simple, inexpensive and easy to build. The circuit to the battery and when the main source is not available, such as brownouts, white LEDs turns on automatically. Initially, the output voltage from 220V to 12V converter is fed to the input of LM317 regulator. Then, this voltage is regulated to 7. 37V with 240 ohms and th


simple emergency led light circuit
Click here to download the full size of the above Circuit.

e combination of the resistance of 1. 2K (see LM317 Calculator). At this time, the battery is in charging mode and the transistor Q1 is off. LED serves two purposes, one is mainly to give us an idea of the battery is charging and the other is to ensure that Q1 is off. During voltage drops, the transistor Q1 is on and supplies the current to 16 white LED of about 20 mA each, so a fully charged battery (6V/4. 5Ah) may last up to 14 hours.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Neon Desk lamp
Dual DC motor speed control
Temperature-measuring-add-on-for-dmm-digital-voltmeter
QRD1114IR Sensor
555 tracking transmitter
LM3551 LM3552 led driver schematic circuit design
Automatic Switch For Voltage Converters
PC-Midi Interface
Simple light delay circuit 3



Top