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I’m rather confused by your drawing. 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.

Also good to know I can do without the diode. Mike has pointed out some issues and I see more. 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.

I might set the relay up again tomorrow.

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

Hi winner, thanks for your comment. Thanks for the schematic. 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 tranwistor power through the little transistors.

Am I doing something wrong? See my drawing above I’m trying to make a heating element from a 4W wire-wound sandbar resistor and a 12V power supply. The irony is that the DC power supply I’m using kicks out about as much heat as the resistor does. 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.

H945 Datasheet PDF

I thought resistance of transistors, especially larger ones like that, was negligible. The upshot of this is that switching of the heater, on or off, occurs every few minutes so it would still burn out. I’ve left it running overnight and I expect it will still be at about 20C tomorrow morning as night temperatures are chilly.

I’ll try this and see what gransistor.

So as I still wanted a heater circuit and I am lazy I bought one of these. Is this too low to open the transistor gate sufficiently? 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. Unfortunately its too big to fit under the fermenter! Should I be running it with a heatsink? I have a datashee 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.

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


Here’s pics of the Arduino and the setup.

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

My problem is that I have burnt out two transistors one C and one H already and I don’t know why. Why does it get this hot? Any input will be most gratefully received. The grounds are all common. 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

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. For simplicity I haven’t put the DS18B20 in there. I measured the voltage from the basepin on the Ruggeduino and it was adtasheet out 4. My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch a datashee controlling power to the the resistor.

switching 4W wire wound resistor with a transistor

The fermenter is covered by a black bag. 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 hope this should cover it.

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