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My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch a transistor controlling power to the the resistor. For example, its now running off 6V and I’ve got it running straight off the power supply without an control. 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. The irony is that the DC power supply I’m using kicks out about as much heat as the resistor does.

H945 Datasheet, Equivalent, Cross Reference Search

Should I be running it with a heatsink? I measured the voltage from the basepin on the Ruggeduino and it y945 putting out 4. I thought resistance of transistors, h9945 larger ones like that, was negligible. I’ve left it running overnight and I expect it will still be at about 20C tomorrow morning as night temperatures are chilly. So as I still wanted a heater circuit and I am lazy I bought one of these.

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.


Thanks for the schematic. Is this too datasjeet to open the transistor gate sufficiently? The upshot of this is that switching of the heater, on or off, occurs every few minutes so it would still burn out.


I’m trying to make a heating element from a 4W wire-wound sandbar resistor and a 12V power supply. 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.

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 hh945 a much higher temperature than the desired fermentation temp. Why does it get this hot?

H datasheet & applicatoin notes – Datasheet Archive

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

The grounds are all common. Hi pwillard, thanks transistog your input too. I’m rather confused by your drawing.

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. Here’s a snap of the sandbar: Unfortunately its too big to fit under the fermenter! I might set the relay up again tomorrow.


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. For simplicity I haven’t put the DS18B20 in there. See my drawing above My problem is that I have burnt out two transistors one C and one H already and I don’t know why. Also good to know I can do without the diode.

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.

The fermenter is covered by a black bag. You haven’t included a pull-down resistor so I take it you think I don’t need one at all.

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

H945 Datasheet PDF

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