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- MagnusR2 commented on shapespeare's instructable Metric Bread
- MagnusR2 commented on kai.h's instructable PID Temperature Controlled OvenView Instructable »
Seems to be also perfect for reflowing of solder on PCBs.

- MagnusR2 commented on apapercraft's instructable Modular Honeycomb ShelvesView Instructable »
Quite interesting and thanks for linking to the other projects. Seeing your construction, the weakest points are probably the connections of the planks. The tape you used before the gluing should give some additional stability. Instead of the tape you could also use thin cardboard or paper and glue it there with large overlaps. That could increase the stability of these points.

- MagnusR2 followed Akin Yildiz
- MagnusR2 commented on Chris Project's instructable DC Motor Speed ControllerView Instructable »
I totally agree that MOSFET are typically not intended to be driven in linear mode, but this circuit does drive the MOSFET in linear mode. So when then the question arises how much you can scale this up to bigger motors, the data sheet does not give the answer, because the data sheet does not anticipate such a usage of the device. The SPICE model also does not give the answer to the linear operation mode. There are however a few applications where MOSFETs do need some linear mode capability, so some competitors quote a more accurate capability on their data sheets, including a DC rating and the Spirito region. Look if the lines in the save operation area figure have a kink in line determined by the power dissipation (lines which go from top left to bottom right). If the lines shows such a…

see more » - MagnusR2 commented on Chris Project's instructable DC Motor Speed Controller
When he asks for 12V I assume he is no longer using a battery as power supply. Anyway 110A is what you can get through the MOSFET if you turn it on completely (VGS=10V says data sheet), but if the MOSFET has handle a voltage drop in linear mode, that is a completely different matter. Then you reduce the VGS with your potentiometer and the RDSon rises and you cannot send 110A through it anymore... I guess you are right that the 9V block will probably not blow up the device, but you cannot be certain, just from the few information given by the datasheet. When force your device in linear mode and the MOSFET has to handle a VDS of just 9V, it will likely blow up when you drive more than 10A through it. I did not try it for this device, but I have bad experience driving MOSFETs in linear mode.

View Instructable »Not sure. The data sheet of IR is missleading. Important is how much current your motor can draw. According to current and voltage your are driving the MOSFET in the linear Mode with this circuit and MOSFET then often die because of a thermal runaway in the so called Spirito region. Some manufacturers show that region on their datasheets in the Save Operation Area, but IR does not and they don't even show the DC rating. So if you want to figure out if it blows up, look for a data sheet where the linear mode performance for DC currents is shown in the datasheet together with the spirito region. I found this document explaining linear mode performance in more detail: https://cache.nxp.com/documents/technical_note/TN00008.pdf

550f is not metric. 288°C is that in the metric system. My Ofen just goes to 230°C. And about the errors you are wrong. If you measure 10 Cups which are wrong by 5% or 1 Cup which is wrong by 5% you will be in any case wrong by 5%. If the Cup is not wrong, but your method of using it is 5% inaccurate, then 1 cup is 5% wrong, but for 10 cups your errors will partly cancel each other out and you will be much more accurate and just in the worst possible case you will still be 5% wrong. The expected error for 10 cups is according to Gauss square root of (10*5*5)/1000 and that is about 1.5%.