I have drawn out a circuit diagram, just wanted to know if it is correct.



Thank you

Looks pretty good, except for some reason, SW3 on the Theromstat doesn't look quite right... If closed it would create a dead short on the 12V side of your transformer. Is SW3 really necessary ? ... or is it just a "backup"... in which case it should go to the same spot as SW2... ?

It also appears you using a double pole, double throw switch, SW1 ?

Nice diagram by the way...

cheers,
gs

no the thermostat doesnt actually look like that, just there was no component for it so i just made that but the thermo needs 12v which is what SW3 is ment to be.


thanks

what are you using for a themo switch then ? does it have a relay or something ? ... guess I wonder why it needs power... maybe for a display ??

gs

im using this thermostat kit:

http://www.maplin.co.uk/Module.aspx?Module...mostat&doy=18m4

it has aq thermistor and a relay and can detect from 5 degrees to 30 degrees. it also has jumpers that you can change so that the switch (relay) opens or closed at a specified number of degrees. i think i should have the switch close at 30 degrees.

thanks

that's neat... and pretty inexpensive too...

thanks for the link.
gs

do you think that it will be okay to set the thermostat to 30 degrees?


thanks

Cool device (pun intended) but 30°C is kinda low. I wonder if it could be readily hacked to go to more like 43°C or so? Still, 30°C could be made to work if you place things properly I suppose.

Well, 30°C is 86°F (sorry many of us 'states' people mostly understand °F ... well me anyway... as this is what our news programs report) I guess the question is what are the ambient temperatures like where you'll be placing it ? (if it gets close to or above 30°C then the fans will never cut off.) This range is probably suitable for turning your fans on/off... assuming ambient temperature remains below 30°C. I think the majority of people adding thermostats actually use it to cut off the lamp if the LCD temp gets too high... in that case you would need something rated higher, like to 45°C or so...

gs

im just gnna use the device for fans, maybe later on i could put a device which allows the lamp to be cut off.

thanks for your help and time