interfacing uln2003 and relay to drive a high power sirern

[wajbharath]

uln2003

hi

i want to drive a high power buzzer of 12v from 8051 using uln2003 and relay ckt,
can any one suggest me how do i hav to connect the circuit.
please help its urgent.

 

[betwixt]

uln2003 relay

simple.

8051 (port pin) -----> ULN2003 (input pin)

ULN2003 (output pin) -----> Relay (- side)

Relay(+ side) ------> 12V

Also connect the ground of the 2003 to 0V (the same 0V as the 8051) and
the clamp pin of the 2003 (pin 9) to 12V.

The ULN2003 has several identical driver circuits, whichever you choose, use the appropriate input and output pins.

If the buzzer runs on 12V, you might be able to drive it directly from the 2003 and leave the relay out.

Brian.

 

[wajbharath]

uln 2003 relay

hi

thank u very much, i got it working
i really appreciate ur help and advice.