[SOLVED] uln 2003 n electromagnetic re

[chetan6491]

how uln 2003 can drive a relay, becoz my project guide told uln 2003 has very high current gain, has it has 2 transistors interconnected???????
we have used 3 electromagnetic relay

 

[sherazi]

connect one pin of the relay coil to your +ive supply or 12v or whatever, and the second pin should be connected to ulns output , if at the input you provide a positive signal , the uln will invert it to Gnd and your relay will be powered
www.youtube.com/watch?v=ZBfwz6uRHq8

 

[alexxx]

how uln 2003 can drive a relay

https://www.edaboard.com/threads/204517/

Just make sure to use a flyback diode in parallel with the relay coil.

https://en.wikipedia.org/wiki/Flyback_diode
https://www.physics.unlv.edu/~bill/PHYS483/relay.pdf

Hope it helped,
Alexandros

 

[chetan6491]

can anyone tell what is the abbreviation of uln in uln2003