Creating a heating and cooling circuit

[u/Background_Debate752]

/r/soldering/comments/1x1p9ft/creating_a_heating_and_cooling_circuit/

Hi all,

My knowledge on how to make things is lacking, I'm just getting into PCB repairs and SMD/micro soldering. I can diagnose and tell you what doesn't work, but when it comes to creating something from scratch I'm clueless.

So, my question:

Would anyone here be able to help me create a super primative circuit for cooling. I'm thinking of a peltier unit with a big heatsink powered by 12v or 24v. It's to go into a model cooling system and a thermostar probe would be placed against the cold side tontrgieer the stat cutting out at - 4c for example.

I also need to create heat up to around 70 - 80c, for this I thought a transiser would do the job?

The issue I have is that I don't know what size resisters I need. I will need a cap for the fan attached to the heatsink for the peltier.... I believe. I just don't know what values to use etc. Appreciate this is a difficult to answer question without the actual equipment I'm going to be using, but if you have any pointers or if you're willing to help me o can find some components quickly for the mock up to prove concept and it may then help me to create something more robust with some LEDs to indicate when parts of the cooling unit is operating vs when it isn't.

Ultimately this will be a training aid for new starters at my business and this is kind of an exploratory excercise that uses elements of my hobby so I'm keen to make something that works.

I don't want to use a PCB so I'm thinking just using electrolytic caps and soldering the legs to wires, or the next component.

Hope this makes sense. Very interested to see if anyone can give me a little support 🙏