Thermostat

[koossa]

Good day

My father purchased a thermostat hobby kit to switch a element on and off for his little parrots.
See (http://www.esr.co.uk/manuals/manual_mk138.pdf)

The relay that's in the circuit cannot handle 220v AC, can I replace it with a relay that can handle 220v AC or can I use the temperature sensor in my own pic project to switch another relay from picbasic?

Thank you!!

[Ioannis]

Th relay footprint is common and you can find all flavors of relays.

Another solution is to use an external 24V relay and then drive your 220 volt load.

Ioannis

[koossa]

Ioannis, thank you very much for your reply.

So do I understand correctly that one option is to replace the relay with another one that's for example 12v / 220v?

[Ioannis]

You are correct.

Have a look at digikey, farnell or you favorite provider.

Ioannis

[koossa]

Thank you very much, I really appreciate it!!!

[malc-c]

Or you could use an opto-isolator and Triac to switch the mains voltage. The advantage of a relay is that it's fairly safe, but the noise from being energized could send you an your parrot bonkers !

[koossa]

Thank you Malc

I don't want to blow anything up, so I must make sure I do the right thing!


Will it work if I replace my Relay with this one http://za.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=3998225

Thank you !!

[malc-c]

Can't say for sure... from the spec I would say that should work - the Coil is 12v and the contact 240V and it appears that the contacts are rated at 10A, but then the tracks on the PCB have been designed to carry 24v at max 3A, so placing 240v at upto 10A could fry the board and obviously if left exposed is dangerous.

[malc-c]

or can I use the temperature sensor in my own pic project to switch another relay from picbasic?



You could use a DS18B20 or LM35 digital sensor and a PIC and easily make your own - I've just completed a 4ch pulse proportional thermostat and light controller for my snakes based on an 18F4580 and 4 x DS18B20 sensors

[koossa]

Thank you Malcolm.

Would it also work if I "reinforce" the 220v part of the tracks with thick copper cable?

[malc-c]

To be honest - mount the relay off the board - then take two wires from the coil to the PCB, then wire your mains wiring to the relay.

[Ioannis]

Malcom, have you done any Audio Amplifiers or Pre-amps inthe past?

Ioannis

[malc-c]

No, why ???

[Ioannis]

I noticed the transformer was placed at 45 degrees. Usually on audio systems was placed that way.

Ioannis

[malc-c]

I noticed the transformer was placed at 45 degrees. Usually on audio systems was placed that way.

Ioannis

LOL - I wish i could say there was a technical reason for that, such as to reduce interference or for aesthetics, ..... but truth is the case has lots of pre molded standoffs and that was the only way I found two standoffs at the correct pitch to secure the transformer to :)

[Ioannis]

LOL! I like the documented and scientific explanation..!

Good one!

Ioannis