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The grounds are all common. Am I doing something wrong? I’ve left it running overnight and I expect it will still be at about 20C tomorrow morning as night temperatures are chilly.

The upshot of this is that switching of the heater, on or off, occurs every few minutes so it would still burn out. 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. See my drawing above Mike has pointed out some issues and I see more. Also good to know I can do without the diode. Here’s a snap of the sandbar: 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’m rather confused by your drawing.

I’m trying to make a heating element from a 4W wire-wound sandbar resistor and a 12V power supply. Is this too low to open the transistor gate sufficiently?

Thanks for the schematic. 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. 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. So as I still wanted a heater circuit and I am lazy I bought one of these.

Unfortunately its too big to fit under the fermenter!

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. Hi winner, thanks for your comment. Any input will be most gratefully received.

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You haven’t included a pull-down resistor so I take it you think I don’t need one at all. The fermenter is covered by a black bag. My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch a transistor controlling power to the the resistor. 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 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. For example, its now running off 6V and I’ve got it running straight off the power supply without an control.

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I measured the voltage from the basepin on the Ruggeduino and it was putting out 4. 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 hope this should cover it. I’ll try this and see what happens. I might set the relay up again tomorrow. I thought resistance of transistors, especially larger ones like that, was negligible.

You say I need to be tranisstor the current from the base of the transistor and the Arduino pin.

Hi pwillard, thanks for your input too. The irony is that the DC power supply I’m using kicks out about as much heat as the resistor does.