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- jkwilborn commented on rjkorn's instructable 3 Axis Arduino Based CNC Controller
- jkwilborn commented on Reichenstein7's instructable Arduino Modules - L298N Dual H-Bridge Motor ControllerView Instructable »
I saw no indication that you could hook these up in parallel in the data sheet, if so, please point that out to me. Most things like this you can't parallel because the small differences in voltage when they switch is a problem. When you do attempt this, at minimum you need some kind of resistance to allow the load to balance. That is usually what you don't want to do as you want it to switch with the lowest on resistance. So adding resistance is futile ^-^ ...IgorS32 pointed this out to everybody in his note about the bad practice of tying different power supply outputs together. Same game...It indicated (to me, the datasheet) that you can pull 4 amps through one side or the other (only one motor port can be used.) Or something like 3.25 amps on one motor and 750 milliamps on the othe…
see more » - jkwilborn commented on MakerBox's forum topic Attiny schematicsView Topic »
Check the Wiki here:https://en.wikipedia.org/wiki/Transistor_countJust curious so I took a couple of minutes. One engineer estimated the AVR 8 bit processors have around 10,000 transistors. Never found a statement from Atmel.One of the micro processor engineers stated something like "we don't start with 500,000 transistors and then figure out how to wire them together."I know it's been a while for this thread, but this Wiki's a good reference.Good luck... :-)
- jkwilborn commented on RazorConcepts's instructable Arduino is Slow - and how to fix it!View Instructable »
When I'm talking about PIND = _BV(PD7) code, the PIND is usually used to read the port, but if the pin is an OUTPUT pin it will flip it on a write. Typo... thanks
- jkwilborn commented on GreatScottLab's instructable Build your own Variable Lab Bench Power SupplyView Instructable »
N8DAH de KA7CMF bkMost of the boards today are very complex and are multi layered. I worked for a manufacturer here and they spent over a 1/2 million for a machine to do the remove and install on our boards which had 6 layers. All of us were very good at soldering, but none of us could change out a chip without damage. This was twenty + years ago, now it's norm in mainstream electronics. I'm sure many of the problems on this are directly related to too much heat or mechanical energy, incorrectly applied. Think of a iPhone, do you think you could solder and unsolder stuff on it. It's the normal today. The best tip, if you can, is to use a solder wick, put electrical flux on it (the wick) and heat as little as possible as quick as possible. Don't use short touches with the iron, as yo…
see more » - jkwilborn commented on JoaoLopesF's instructable How to use 2.4 inch TFT LCD SPFD5408 with Arduino Uno and MegaView Instructable »
Thanks so much. I have just gotten a pair of UNO's and a display. Just curious as I've not found mention of the sd card on the display. Is it like the others I've seen where you can only use if for program data storage or something...Thanks Very much.....JackArizona
Where's the QRP rig stuff? 73s :)