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Hi pwillard, thanks for your input too.

The upshot of this is that switching of the heater, on or off, occurs every few minutes so it would still burn out. 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.

For simplicity I haven’t put the DS18B20 in there. Should I be running it with a heatsink?

For example, its now running off 6V and I’ve got it running straight off the power supply without an control. 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. Unfortunately its too big to fit under the fermenter! Is this too low to open the transistor gate sufficiently? Here’s pics of the Arduino and the setup. 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.


Any input will be most gratefully received. So as I still wanted a heater circuit and I am lazy I bought one of these. You say I need to be limiting the current from the base of the transistor and the Transiistor pin.

Hi winner, thanks for your comment. Thanks for the schematic. I dstasheet switch an 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.

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Am I doing something wrong? At that kinda current I would start looking into mosfets to keep the heat down, after 1amp heat starts to get in the way with transistors.

My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch a transistor controlling power to the the resistor. This is something I’m looking at improving, probably with an immersion heater, but the point I’m trying to make is that you need the heater at a much higher temperature than the desired fermentation temp.

I hope this should cover it. The grounds are all common.

I’m trying to make a heating element from a 4W wire-wound sandbar resistor and a 12V power supply. I thought resistance of transistors, especially larger ones like that, was negligible. Mike has pointed out some issues and I see more. You could probably cycle it with the 7v supply, add another ds18b20 easily and when it reaches max temperature, kill it and when it drops a bit turn it on it has enough thermal mass to keep things warm in between.


The irony is that the DC power supply I’m using transistr out about as much heat as the resistor does.

H945 Datasheet PDF

The fermenter is covered by a black n945. At 12V I calculate that the 4W sandbar will be dissipating all of that, which explains the rapid release of magic smoke from them. 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 rtansistor, thanking you.

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 datashet little transistors. My problem is that I have burnt out two transistors one C and one H already and I don’t know why. I measured the voltage from the basepin on the Ruggeduino and it was putting out 4.

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Why does it get this hot? Also good to know I can do without the diode. I’m rather confused by your drawing. I might set the relay up again tomorrow. I’ve left it running overnight and I expect it will still be at about 20C tomorrow morning as night temperatures are chilly.

Here’s a snap of the sandbar: