Hello all
I just bought a boat and I am trying to figure out all the things that needs to be done before the fishing season begins. I have two 12V batteries in my boat, with 65Amps on them. I have an electrical cooling box, wich can hold my beer cold during a hot summerday on the water, but it doesnt have a thermostat. So what better way to get more into electronics, than just building one myself.
Ive found this (the very top one) circuit for the thermostat, which is simple and seems to work for the designer:
http://www.craig.copperleife.com/tech/thermo/
I am not sure that I understand all what he discripes, but I hope that one of you guys can help me out there. The only thing I want the circuit to do, is to be able to adjust from 0 degres celcius to 10 degres celcius.
Now that I am building such a device, I would like to put in a battery safeguard, so I dont drain all the power of the battery.
I was thinking of using a LM311, for both the thermostat and the safeguard. The question is now, how do I get the reference voltage, that has to come into PLUS on the LM311? The voltage IN that goes to the MINUS of the LM311 is comming from the boat battery I guess?
/Jacob
PS:
Am I right, that I can swap the VR1 with a normal resistor as soon as I have figured out, where 0 degree celsius triggers the circuit?
The VR2 is the sensitivity right? It deturments how accurate the circuit is going to be. I have read that the relay will jigger if it is put too sensitive. Will I also be able to replace the potentiometer VR2 with a normal resistor as soon as I have figured out the sensitivity the circuit has to be at?
I just bought a boat and I am trying to figure out all the things that needs to be done before the fishing season begins. I have two 12V batteries in my boat, with 65Amps on them. I have an electrical cooling box, wich can hold my beer cold during a hot summerday on the water, but it doesnt have a thermostat. So what better way to get more into electronics, than just building one myself.
Ive found this (the very top one) circuit for the thermostat, which is simple and seems to work for the designer:
http://www.craig.copperleife.com/tech/thermo/
I am not sure that I understand all what he discripes, but I hope that one of you guys can help me out there. The only thing I want the circuit to do, is to be able to adjust from 0 degres celcius to 10 degres celcius.
Now that I am building such a device, I would like to put in a battery safeguard, so I dont drain all the power of the battery.
I was thinking of using a LM311, for both the thermostat and the safeguard. The question is now, how do I get the reference voltage, that has to come into PLUS on the LM311? The voltage IN that goes to the MINUS of the LM311 is comming from the boat battery I guess?
/Jacob
PS:
Am I right, that I can swap the VR1 with a normal resistor as soon as I have figured out, where 0 degree celsius triggers the circuit?
The VR2 is the sensitivity right? It deturments how accurate the circuit is going to be. I have read that the relay will jigger if it is put too sensitive. Will I also be able to replace the potentiometer VR2 with a normal resistor as soon as I have figured out the sensitivity the circuit has to be at?
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