ole00

Thanks for the pictures of the revision 9, it's interesting how "innovative" these guys are :). I can't spot the difference between revision 8 (only the solder point of the...

Thanks for the comment, one of my colleague also mentioned that idea, but frankly I'm not sure how exactly to accomplish that. If you can modify the schematic and draw...

Thanks for the explanation and the drawings. It now looks clear. I think that the 2.5V reference voltage may not be necessary as ATTiny13a can be set to either measure...

I tried to measure the resistance of the heating element, but unfortunately I can not give a decisive result of the measurement. My multimeter is probably not sensitive enough for...

Well, in that case my USB meter shows currents between 0.8 A on low temperature profile and in between 1.2 to 1.3A on max. temperature. So the resistance of the...

Ah... There is a catch. I could not find a 1Ohm resistor power rated at 10-20W that is small enough to fit into the soldering iron body. Also, such circuit...

Well, there is an idea: the MOSFET itself has a resistance, which is low but that's what we need. According to a paper from ST (google 'MOSFET gate resistance') the...

> It would make more sense to put the iron on full throttle and watch it heating up to draw graph of current x temperature. The current should drop as...

Another option is to use MOSFET with Rds(ON) of 0.5 - 1 Ohm (maybe this one? https://uk.rs-online.com/web/p/mosfet-transistors/0362793/). It would require to replace (and desolder) the old MOSFET, but it would...

>I guess it will take some time, before my iron arrives from china (month or so). It looks the iron can be bought locally as well (possibly less time to...