Conver TTL into Relay

[topex]

Can i also ask for a list of compatible relays to be use to turn on/off some appliances in the house using that relay... Our group is having a hard time looking for the prescibed relay that we've found on one of our research project.

[K C]

Choosing relays is not as simple as one might think.

depends on: switch voltage, switch current, nominal voltage, nominal current, AC and/or DC, temperature, reaction time, number of contacts, electrical lifetime, mechanical lifetime, coil voltage, and so on.....

[topex]

We are supposed to use a 12V relay (RWH-SH-112D) rated as 250VAC at 12A but its not available in any electronic shop we've visited. Do you have any suggestion for us to use as alternative to this relay?

[K C]

Try a search at Farnell

With a quick look I found G2R-1A-E-DC12 from Omron. See this for a complete list of 12VDC  SPST relays

[Austin_W]

Digi-Key.com is also another good option.  A quick search there for 12V relay rated at 12A @ 250VAC gives these results.

[topex]

We've found our option... But we are not sure if it will work... We indeed need a relay rated as 250VAc at 12A. We found a relay in the market with a rating of 250VAC but at only 10A. Do you think it would work with our circuit?? It only consists of a parallel port connected to a relay driver which is connected to a relay. A 12V input is also use to power the circuit. Our required output should make any home appliances work.

[K C]

Where I live normally the home circuit breakers are 16A. So any relay used at home must be capable of handling 16A. With a bit of safety build in I would use 18 to 20A

[topex]

Ok ... Thanks for all the replies...

[Warp]

Hi ! I did´nt find a ULN2803 model in Multisim Library. Can someone help me to find a article, link or similar that teach to build or import that model ?

Thanks a lot ! 

[Buechsenschuetz]

Maybe you can build your own model using the "inner circuit" of the ULN2803. Each section consists of two resistors, two transistors (an NPN universal model will do) and a diode.