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Unfortunately its too big to fit under the fermenter! Should I be running it with a heatsink? 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 translstor transistors. 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.
You say I need to be limiting the current from the base of the transistor and the Arduino trahsistor. Any input will be most gratefully received.
I’m trying to make datqsheet heating element from a 4W wire-wound sandbar resistor and a 12V power supply. 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. 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.
Hi pwillard, thanks for your input too. I thought resistance of transistors, especially larger ones like that, was negligible.
Here’s a snap transistog the sandbar: Why does it get this hot?
H datasheet & applicatoin notes – Datasheet Archive
Also good to know I can do without dstasheet diode. 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 upshot of this is that switching of the heater, on or off, occurs every few minutes so it would still burn out.
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 PDF
So as I still wanted a heater circuit and I am lazy I bought transstor of these. Is this too low to open the transistor gate sufficiently? 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.
My problem is that I have burnt out two transistors one C and one H already and I don’t know why. I’m rather confused by your drawing.
Mike has pointed out some issues and I see more. Hi winner, thanks for your comment. I’ve left it running overnight transistot I expect it will still be at about 20C tomorrow morning as night temperatures are chilly. 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.
Thanks for the schematic.
H945 Datasheet, Equivalent, Cross Reference Search
Here’s pics of the Arduino and the setup. The fermenter is covered by a black bag. You haven’t included a pull-down resistor so I take it you think I don’t need one at all. My Ruggeduino is using temperature measurements from a DS18B20 sensor to determine when to switch a transistor catasheet power to the the resistor. I might set the relay up again tomorrow. I’ll try this and see what happens.
For simplicity I haven’t put the DS18B20 in there. Am I doing something wrong? I can switch an LED on and off with this circuit not at 12V, transustor but when I try it with the sandbar it quickly goes up in smoke. I measured the voltage from the basepin on the Ruggeduino and it was putting out 4. See my drawing above At 12V I calculate that the 4W sandbar will be dissipating all of that, which explains the rapid release of magic smoke from them.
The irony is that the DC power supply I’m using kicks out about as much heat as the resistor does. I hope this should cover it.