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Hi winner, thanks for your comment.

My problem is that I have burnt out two transistors one C and one H already and I don’t know why. 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. Any input will be most gratefully received. 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 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.

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 trabsistor in smoke. I might set the relay up again tomorrow.

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

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


I thought resistance tranistor transistors, especially larger ones like that, was negligible. Should I be running it with a heatsink? Unfortunately its too big to fit under the fermenter!

My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch a transistor controlling power to the the resistor. Here’s a snap of the sandbar: Thanks for the schematic. I have a flyback diode parallel datasgeet the resistor to disperse any back EMF the resistor coil generates and a pull-down resistor on the base of the transistor.

H945 Datasheet PDF

See my drawing above I’m trying to make a heating element from a 4W wire-wound sandbar resistor and a 12V power supply. Here’s pics of the Arduino and the setup.

The fermenter is covered by a black bag. You say I need to be limiting the current from the base of the transistor and the Arduino pin.

H Datasheet – NPN Silicon Transistors –

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


Is this too low to open the transistor gate sufficiently? I’ve left it running overnight and I expect it will still be at about 20C tomorrow morning as night temperatures are chilly. The grounds are all common.

(PDF) H945 Datasheet download

After playing around with this for a while I gave up datasyeet 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. I hope this should cover it.

I measured the voltage from the basepin on the Ruggeduino and it was putting out 4. 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.

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. Mike has pointed out some issues and I see more.