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I measured the voltage from the basepin on the Ruggeduino and it was putting out 4. 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. Any input will be most gratefully received. 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. 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.

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. I’m rather confused by your drawing.


Here’s pics of the Arduino and the setup. For simplicity Trxnsistor haven’t put the DS18B20 in there. Should I be running it with a heatsink? The grounds are all common.

My problem is that I have burnt out two transistors one Transistot and one H already and I don’t know why. The upshot of this is that switching of the heater, on or off, occurs every few minutes so it would still burn out.

H datasheet & applicatoin notes – Datasheet Archive

Am I doing something wrong? I might set the relay up again tomorrow. Thanks for the schematic. I thought resistance of transistors, especially larger ones like that, was negligible. Mike has pointed out some issues and I see more. I’ll try this and see what happens.

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 say I need to be limiting the current trandistor the base of the transistor and the Arduino pin. My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch a transistor controlling power to the the resistor.

Hi pwillard, thanks for your input too.

See my drawing above Is this too low to open the transistor gate sufficiently? Transistod does it get this hot? 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. For example, its now running off 6V and I’ve got datawheet running straight off the power supply without an control.

H945 Datasheet, Equivalent, Cross Reference Search

So as I still wanted a heater circuit and I am lazy I bought one of these. I can 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.

I’m trying to make a heating element from a 4W wire-wound sandbar resistor and a 12V power supply. 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. Unfortunately its too big to fit under the fermenter! Hi winner, thanks for your comment.