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Mike has pointed out some issues and Dataeheet see more. I am now using a big E transistor not the datasheet for the exact part but a similar one as I thought I was putting too much power through the little transistors.
At 12V I calculate that the 4W sandbar will be dissipating all of that, which explains the rapid release of magic smoke from them. The upshot of this is that switching of trxnsistor heater, on or off, occurs every few minutes so it would still burn out.
My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch a transistor controlling power to the the resistor.
I’ve left it running overnight and I expect it will still be at about 20C tomorrow morning as night temperatures are chilly. Hi winner, thanks for your comment.
I hope this should cover it. You haven’t included a pull-down resistor so I take it you think I don’t need one at all. I’ll try this and see what happens. At that kinda current I would start looking into datashet to keep the heat down, transitsor 1amp heat starts to get in the way with transistors.
Why does it get this hot?
H945 Datasheet, Equivalent, Cross Reference Search
You say I need to be limiting the current from the base of the transistor and the Arduino pin. Here’s a snap of the sandbar: I’m trying to make a heating element from a 4W wire-wound sandbar resistor and a 12V power supply.
I’m rather confused by your drawing. The grounds are all common. For simplicity I haven’t put the DS18B20 in there. So as I still wanted a heater circuit datasjeet I am lazy I bought one of these.
H datasheet & applicatoin notes – Datasheet Archive
Hi pwillard, thanks for your input too. Thanks for the schematic. I have a flyback diode parallel to the resistor to disperse any back EMF the resistor coil generates and a pull-down resistor on the base of the transistor.
The irony is that the DC power supply I’m using kicks out about as much heat as the resistor does. I measured the voltage from the basepin on the Ruggeduino and it was putting out 4.
See my drawing above Because the heater is just stuck on the bench underneath the fermenter, with a little insulation around it, thermal transfer to the vessel is poor at this stage.
You could probably cycle it with the 7v supply, add another ds18b20 easily and when it reaches max temperature, transiator it and when it drops a bit turn it on it has enough thermal mass to keep things warm in between. Unfortunately its too big to fit under the fermenter!
Here’s pics of the Arduino and the setup. I can switch tgansistor LED on and off with this circuit not at 12V, obviously but when I try it with the sandbar it quickly goes up in smoke. I thought resistance of transistors, especially larger ones like that, was negligible. Am I doing something wrong?
I might set the relay up again tomorrow. Any input will be most gratefully received.
(PDF) H945 Datasheet download
After playing around with this for a while I gave up as the big transistor I was using had to be reallocated to another project which is working wonderfully, thanking you. Also good to know I can do without the diode.
The fermenter is covered by a black bag.