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For example, its now running off 6V and I’ve got it running straight off the power supply without an control. For ttransistor I haven’t put the DS18B20 in there.

I have ttransistor 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.

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

H945 Datasheet, Equivalent, Cross Reference Search

The grounds are all common. Should I be running it with a heatsink? 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.

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.

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


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 h94 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 transisror temperature than the desired fermentation temp.

Also good to know I can do without the diode. 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. I thought resistance of transistors, especially 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.

Thanks for the schematic.

At 12V I calculate that the 4W sandbar will be dissipating all of that, which explains the rapid release of magic smoke from them. You haven’t included a pull-down resistor so I take it you think I don’t need one at all. I measured the voltage from the basepin on the Ruggeduino and it was putting out 4.

H945 Datasheet PDF

Here’s pics of the Arduino and the setup. I’m rather confused by your drawing. Because the heater is just stuck on the bench underneath the fermenter, with a little insulation around transistoe, thermal transfer to the vessel is poor at this stage. Unfortunately its too big to fit under the fermenter! Why does it get this hot?


H datasheet & applicatoin notes – Datasheet Archive

Am I doing something wrong? I might set the relay up again tomorrow. See my drawing above The irony is that the DC power supply I’m using kicks out about as much heat as the resistor does. Is this too low to open the transistor gate sufficiently?

H Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

Hi pwillard, thanks for your input transitsor. Mike has pointed out some issues and I see more. You say I need to be limiting the current from the base of the transistor and the Arduino pin. The fermenter is covered by a black bag. 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.

After playing around with this for a while I gave up as the big transistor Tansistor 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’ll try this and see what happens.