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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.

H945 Datasheet, Equivalent, Cross Reference Search

Also good to know I can do without the diode. 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. My problem is that I have burnt out two transistors one C and one H already and I don’t know why.

So as I still wanted a heater circuit and I am lazy I bought one of these. Unfortunately its too big to fit under datassheet fermenter!

I’m trying to make a heating element from a 4W wire-wound sandbar resistor and a trqnsistor power supply. Mike has pointed out some issues and Datasbeet see more. Hi winner, thanks for your comment. 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.

The grounds are all common. 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 resistor on the base of the transistor. You say I need to be limiting the current from the base of the transistor and the Arduino pin.


I’ve left it running overnight and I expect it will still be at about 20C tomorrow morning as night temperatures are chilly.

Should I be running it with a u945 See my drawing above Here’s pics of the Arduino and the setup. The irony is that the DC power supply I’m using kicks out about as much heat as the resistor does. My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch a transistor controlling power to the the resistor. 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. I thought resistance of transistors, especially larger ones like that, was negligible. Hi pwillard, thanks for your input too. Because the heater is just stuck on the bench datashest the fermenter, with a little insulation around it, thermal transfer to the vessel is poor at this stage. For simplicity I haven’t put the DS18B20 in there.


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. At 12V I calculate that the 4W sandbar will be dissipating all of that, which explains the rapid release of magic smoke from them.


Am I doing something wrong? I’m rather confused by your drawing.

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. Here’s tramsistor snap of the sandbar: Why does it get this hot? The upshot of this is that switching of the heater, on or off, occurs every few minutes so it would still burn out.

Is this too low to open the transistor gate sufficiently? I hope this should cover it.

H945 Datasheet PDF

Thanks for the schematic. You could probably cycle it with the 7v supply, add another ds18b20 easily and when it reaches max temperature, kill transisyor and when it drops a bit turn it on it has enough thermal mass to keep things warm in between.

I might set the relay up again tomorrow. 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. Any input will be most gratefully received.

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