light control

[FlashCreated]

hi,
i'm tring to make a 4v circuit to controle a 220v light bulb, aka i have a switch in my room so in the light switch ther will be 3 wires, ground positiv and negative, i need a circuit that i hook up to it to turn the light on and off with a standard 12v switch on the 4v circuit.

Forgive the spelling mistakes.

Thanx in advance!

FlashCreated

 

[(*steve*)]

...And do it all without killing yourself.

The short answer is "with a relay", but are you sure you want to be playing around with 220VAC?

 

[FlashCreated]

thanx!
i know that it's not the safest V there is...
but there is no uther way is there?

 

[FlashCreated]

by the way could i use this relay?
will i be able to switsh it with a rs232?
http://docs-europe.origin.electrocomponents.com/webdocs/0578/0900766b8057845f.pdf

 

[Resqueline]

No, not directly, it draws way too much power. Look for Solid State Relays instead, they work from 3V upwards and draws only a few mA.

 

[neon]

NO NO NO a realy it may work at 4 volts DC but the contacts must be rated to the right amperage and current rating otherwise it may work once and never again. solid state realy for 230v is somebody dreaming or what. get the right relay to begin with the worry about turn it on later

 

[(*steve*)]

Neon, why not a SSR? I have a couple here rated at between 480 and 600V at between 25A and 40A. They're certainly capable of switching mains to a light circuit.

Here is an example.

p.s. Neon, "amperage and current rating" are the same thing.

 

[FlashCreated]

thanx for al your replys!
ok so if i used this cuircuit named "Building your own relay controlling circuits": http://www.epanorama.net/circuits/parallel_output.html#relaycontrol

first: what is vcc?
second: what relay could i use to switch 240V ac light in my home on and off?

thanx in advance!

 

[(*steve*)]

That site was offline for a while, so I couldn't answer.

Vcc is essentially the + side of the low voltage powering your logic. It is typically 5V to 12V

What relay? Didn't we answer that above? Although if you're driving it from a separate power supply, you simply need a relay with contacts rated to switch your load and a coil with a voltage equal to your Vcc. If your Vcc is very low you may have problems.

 

[FlashCreated]

so vcc is basicaly a power supply. Do plug the ground side of it to one of the parallel port ground pins?
ok well that web site is working again so can someone tel me, this circuit:http://www.epanorama.net/circuits/parallel_output.html#relaycontrol what relay could i use? What power supply could i use?

thanx in advance!

 

[Resqueline]

A bit further down the page you linked to you'll find how to implement Solid State Relays. They can be had in many sizes and can be driven directly from the port.
You won't need any extra power supply and transistors using SSR's.