• June 21, 2019

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You say I need to be limiting the current from the base of the transistor and the Arduino pin. Thanks for the schematic. See my drawing above 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.

You haven’t included a pull-down resistor so I take it you think I don’t need one at all. Am I doing something wrong? The upshot of this is that switching of the heater, on or off, occurs every few minutes so it would still burn out. Should I be running it with a heatsink? Is this too low to open the transistor gate sufficiently?

(PDF) H945 Datasheet download

Mike has pointed out some issues and I see more. I’ve left it running overnight and I expect it will still be at about 20C tomorrow morning as night temperatures are chilly.

The fermenter is covered by a black bag. I tranistor resistance of transistors, especially larger ones like that, was negligible. I’m rather confused by your drawing.


Unfortunately its too big to fit under the fermenter! I’m trying to make a heating element from a 4W wire-wound sandbar resistor and a 12V power supply. I measured the voltage from the basepin on the Ruggeduino and it was putting out 4. 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. The grounds are all common.

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. Hi winner, thanks for your comment. I’ll try this and see what happens. The irony is that the DC power supply I’m using kicks out about as much heat as the resistor does.

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. Hi pwillard, thanks for your input too.

H945 Datasheet PDF

You could probably cycle it with the 7v supply, add another ds18b20 easily and when it reaches max temperature, kill transistog and when it drops a bit turn it on it has enough thermal mass to keep things warm in between. For example, its now running off 6V and I’ve got it running straight off the power supply without an control. My problem is that I have burnt out two transistors one C and one H already and I don’t know why.


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

So as I still wanted a heater circuit and I vatasheet lazy I bought one of h9455. I hope this should cover it.

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I am now using a big E transistor datzsheet the datasheet for the exact part but a similar one as I thought I was putting too much power through the little transistors. Why does it get this hot?

Here’s a snap of the sandbar: I might datasheett the relay up again tomorrow. Any input will be most gratefully received. For simplicity I haven’t put the DS18B20 in there.

Here’s pics of the Arduino and the setup. Because the heater is just stuck on the bench tranwistor the fermenter, with a little insulation around it, thermal transfer to the vessel is poor at this stage. My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch a transistor controlling power to the the resistor.