I'm starting a project. I have an air compressor that seems to get very hot while running. I realize they do this as part of the process of compressing the air, but the heat developed also contributes to the inevitable future failure of the compressor. To help prevent a short lifespan, and keep my investment in top shape for a longer period of time, I have decided to to place a fan near the piston of the compressor to aid in cooling it. I don't want the fan to run all the time the it plugged in, and I don't want it to turn on and off at the same time as the compressor, so I need a circuit to keep the fan running till it has cooled off, then switch it off.
I've decided on using a thermistor. http://www.alliedelec.com/search/productdetail.aspx?SKU=2540072#tab=Specs
which will feed into an op amp.
http://www.alliedelec.com/search/productdetail.aspx?SKU=3830229
this will power a solid state relay connected in the emitter circuit of a 2222 transistor.
http://www.alliedelec.com/search/productdetail.aspx?SKU=6824068
This is the compressor I have is a nice little ingersol rand branded one and will feed two seperate tanks besides it's own. Both of them will be in my workshop in the house and will have isolation valves on them to remove them from the air compressor air distribution piping.
Purchased here(It was on sale for less than it is selling for now)
For a power supply I used an a 5 volt adapter from one of my wifes old, no longer used, cell phones.
http://www.everypowercable.com/lg22gt2.html
And it will power a muffin fan, almost identical to this
I have cut and bent and drilled out some mounting holes on a piece of aluminum. The fan will be mounted on it and aimed at the piston. It looks like this.
The relay coil is actually not one. Since I went with a solid state relay device instead of a mechanical one. The compressor vibrates A LOT and I got to thinking that might not be compatiable with a mechanical contact type relay.
The circuit I have come up with is this one.
Hopefully I'll get the parts I ordered tomorrow, if not then next week on Monday or Tuesday(At the mercy of FedEx) and will get to work mounting the circuit components this weekend (or next)
If it all works out like I hope I'll post it in the completed projects forum.
Kermit
I've decided on using a thermistor. http://www.alliedelec.com/search/productdetail.aspx?SKU=2540072#tab=Specs
which will feed into an op amp.
http://www.alliedelec.com/search/productdetail.aspx?SKU=3830229
this will power a solid state relay connected in the emitter circuit of a 2222 transistor.
http://www.alliedelec.com/search/productdetail.aspx?SKU=6824068
This is the compressor I have is a nice little ingersol rand branded one and will feed two seperate tanks besides it's own. Both of them will be in my workshop in the house and will have isolation valves on them to remove them from the air compressor air distribution piping.
Purchased here(It was on sale for less than it is selling for now)
For a power supply I used an a 5 volt adapter from one of my wifes old, no longer used, cell phones.
http://www.everypowercable.com/lg22gt2.html
And it will power a muffin fan, almost identical to this
I have cut and bent and drilled out some mounting holes on a piece of aluminum. The fan will be mounted on it and aimed at the piston. It looks like this.
The relay coil is actually not one. Since I went with a solid state relay device instead of a mechanical one. The compressor vibrates A LOT and I got to thinking that might not be compatiable with a mechanical contact type relay.
The circuit I have come up with is this one.
Hopefully I'll get the parts I ordered tomorrow, if not then next week on Monday or Tuesday(At the mercy of FedEx) and will get to work mounting the circuit components this weekend (or next)
If it all works out like I hope I'll post it in the completed projects forum.
Kermit