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Nice hack, and certainly suitable for an electronics enthusiast. I've done this basic hack several times in the past 45 years, and it is a simple way to make a personal guitar (or utility) amp while recycling an old radio. To minimize hiss it's a good idea to twist tightly the wires from the audio jack.
This is really cool! Does it really use 128 glue sticks or 64? It looks like 64 (8 x 8 matrix), but the material list calls for 128.
Nice, simple amp that people can experiment with. Output power will depend on several factors, but mostly on how efficiently the heat sink dissipates the power in the MOSFET.
This would be a very cool project for collaboration between math, science, and workshop (and electronics or other STEM classes - if present) in a high-school or college setting. Everybody would stand to learn something from the others.
Indeed! Wood is great for laser marking, but it takes some experimenting to get the speed and power just right. Low-detail images often look best with a slightly de-focused beam, but high-detail images usually require sharp focus. I prefer hardwoods for laser engraving; the contrast is stunning!
Woods can be tricky to engrave with a laser, but some tweaking of power and speed (dwell time per dot and off-time between dots) can produce exceptional results. This image was produced (on a laser engraver I designed, built, and programmed myself) on 4”x4”x1/4” maple block.
Sure, but that’s not the point. Lots of people will learn about eddy currents and the relationship between electricity and magnetism. It would have been nice if the author had explained how eddy currents give rise (pun intended) to heating, but this is still a very nice instructable that was highly instructive!
It is a good idea to incorporate a sensor, and I think a temperature sensor just below the cooking surface (perhaps embedded in the Lexan) would also be useful.
These are definitely common mistakes, and your suggestions are excellent. I’d like to add that the process is frequently iterative; just because a schematic is available online doesn’t mean that the circuit is robust. Luckily there are fairly knowledgeable people in most of the major forums, and these folks can be very helpful if/when a circuit doesn’t work as expected.
Coding can be a hurdle for lots of hobbyists, especially when it comes to the use of libraries (most of which IMHO are poorly documented). My usual recommendation when starting to learn how to code is to start small and take baby steps.
Sewing Tools and Supplies
Overall I like the project, but I have to advise against soldering directly to the batteries or tabs. Lithium batteries store a LOT of energy, and when they fail they are capable of reaching very high temperatures. Some of these batteries can easily be damaged by soldering heat. If somebody is interested in doing this project, I recommend that they buy the 18650 batteries with tabs and use appropriate connectors.
This IS a touch switch, even if you have to touch more than one wire at a time; it’s just that the capacitive touch switches that are more common nowadays give the impression to lots of people that a single electrode is the only “proper” configuration for a touch switch.What’s interesting to note is that the ability of the MOSFET to stay in either the ON or OFF state is due to the presence of gate capacitance coupled with a VERY high leakage resistance through the gate oxide layer.
Awesome project and a great write-up. It shows how much work often is necessary to end up with a quality result! The neatness of the finished assembly hides all the intricate work - kudos for accomplishing this AND sharing your trials and tribulations along the way!
Getting Started with Electronics
Nice project! You might want to edit the materials list to correct the plywood specifications for both panels/sheets: they are currently spec'd out as 1 x 8 feet, but should be 4 x 8.
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