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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.

So as I still wanted a heater circuit and I am lazy I datasgeet one of these. See my drawing above At 12V I calculate that the 4W sandbar will be dissipating all of that, which explains the rapid release translstor magic smoke from them.

The fermenter is covered by a black bag. I hope this should cover it. Is this too low to open the transistor gate sufficiently? For simplicity I haven’t put the DS18B20 in there. My problem is that I have burnt out two transistors one C and one H already and I don’t know why. I’m rather confused by your drawing. The grounds are all common. I might set the relay up again tomorrow.

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

Why does it get this hot? I measured the voltage from the basepin on the Ruggeduino and it was putting out 4.

H945 Datasheet PDF

I’m trying to make a heating element from a 4W wire-wound sandbar resistor and a 12V power supply. 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. The upshot of this is that switching of the heater, on or off, occurs every few minutes so it would still burn out. I’ve left it running overnight and I expect it will still be at about 20C tomorrow morning as night temperatures are chilly.


Thanks for the schematic. 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.

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. Here’s pics of the Arduino and the setup. You could probably cycle it with the 7v supply, add another ds18b20 easily and when it reaches max temperature, kill it and tansistor it drops a bit turn it on it has enough thermal mass to keep things warm in between.

H Datasheet(PDF) – Kwang Myoung I.S. CO.,LTD

You say I need to be limiting the current from the base of the transistor and the Arduino pin. Hi datasneet, thanks for your input too.

I’ll try this and see what happens. I have a flyback diode parallel to the resistor to disperse any back EMF the resistor coil generates and a pull-down datssheet on the base of the transistor. Am I doing something wrong?


Mike has pointed out some issues and I see more. I thought resistance of transistors, especially larger ones like that, was negligible. Also good to know I can do without the diode. For example, its now running off 6V and I’ve got it running straight off the power supply without an control.

Should I be running it with a heatsink? Here’s a snap of the sandbar: My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch a transistor controlling power to the transiistor resistor.

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. Unfortunately its too big to fit under the fermenter! Any input will be most fransistor received.

Because the heater is transidtor stuck on the bench underneath the fermenter, with a little insulation around it, thermal transfer to the vessel is poor at this stage. Hi winner, thanks for your comment.

transustor 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.