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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. The grounds are all common.

Why does it get this hot? Here’s a snap of the sandbar: I might daatasheet the relay up again tomorrow. You haven’t included a pull-down resistor so I take it you think I don’t need one at all. 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. The irony is that the DC power supply I’m using kicks out about as much heat as the resistor does.

H datasheet & applicatoin notes – Datasheet Archive

The fermenter is covered by a black bag. 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. Here’s pics of the Arduino and the setup. At 12V I calculate that the 4W sandbar will be dissipating all of that, which explains the rapid release of magic smoke from them.


Any input will be most gratefully received.

I can switch an LED on and off with this circuit not at 12V, obviously but when I try it with the sandbar transsistor quickly goes up in smoke. I’m rather confused by your drawing.

(PDF) H945 Datasheet download

See my drawing above You say I need to be limiting the current from the base of the transistor and the Arduino pin. I measured the voltage from the basepin on the Ruggeduino and it was putting out 4. Am I doing something wrong?

Hi winner, thanks for your comment. Mike has pointed out some issues and I see more. Unfortunately its too big to fit under the fermenter!

So as I still wanted a heater circuit and I am lazy I bought one of these. For simplicity I haven’t put the DS18B20 in there. Hi pwillard, thanks for your input too.

I’m trying to make a heating element from a 4W wire-wound sandbar resistor and a 12V power supply. My problem is that I have burnt out two transistors one C and one H already and I don’t know why. You could probably trandistor 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.


This is something I’m looking at improving, probably with an immersion heater, but the point I’m trying to make is that you datasheeh the heater at a much higher temperature than the desired fermentation temp.

H Datasheet – NPN Silicon Transistors –

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.

I hope this should cover it. My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch a transistor controlling power to the the resistor. Also good to know I can do without the diode.

H945 Datasheet PDF

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? I thought resistance of transistors, especially larger ones like that, was negligible.