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The Sanguino is an extension of the popular Arduino board designed and developed by Zach Hoeken et.al. for the RepRap Research Foundation.
Re: My mods for curing 5V USB/7805 problems on Sanguinololu 1.3a - 11 years ago
I removed the regulator but it was harder than it should be. The middle pin didn't want to desolder at all. Had to break it off and force the remains out with the soldering iron. I tried to reconnect it again as you said but I didn't solder and the connection might have been bad, anyway it didn't get hot. Now with the USB powering the 5V rail I get about 4.75V. I think i got 4.96 or something befby floppy - Sanguino(lolu)
Re: My mods for curing 5V USB/7805 problems on Sanguinololu 1.3a - 11 years ago
Then how can it get hot? Do you think it will help to buy a new regulator, maybe with other spec.? And could the diode method help?by floppy - Sanguino(lolu)
Re: My mods for curing 5V USB/7805 problems on Sanguinololu 1.3a - 11 years ago
Ok I'll measure the resistance then. Sorry, what am I looking for? Edit: GND: pin18 and pin19 measured 9.9 something. 5V: pin18 and pin19 measured 10 something 12V: Nothingby floppy - Sanguino(lolu)
Re: My mods for curing 5V USB/7805 problems on Sanguinololu 1.3a - 11 years ago
I don't want to desolder my AtMega chip. Any other way?by floppy - Sanguino(lolu)
Re: My mods for curing 5V USB/7805 problems on Sanguinololu 1.3a - 11 years ago
Now without the stepsticks I got 110mA. Then i connected the USB and I got 120mA.by floppy - Sanguino(lolu)
Re: My mods for curing 5V USB/7805 problems on Sanguinololu 1.3a - 11 years ago
I haven't measured the current, only voltage. To do it, I have to break the circuit somewhere, right? I can't just touch two points. Edit: I measured in series with the input 12V screw terminal and the power source. It was about 135mA. How can I locate this drain? I have disconnected everything and it gets hot. No other component is hot, not even warm. Perhaps something under the stepper driverby floppy - Sanguino(lolu)
Re: My mods for curing 5V USB/7805 problems on Sanguinololu 1.3a - 11 years ago
I've found a nice online store to buy the schottky diodes. The BAT42 spec says: voltage drop 0.4V, voltage 30V, current 0.2A. Will it work? What is the maximum current running? I think I will buy a voltage regulator as spare part, now that I'm ordering stuff. Then I need to know the max. output current. Any thoughts about why my regulator is still hot?by floppy - Sanguino(lolu)
Re: My mods for curing 5V USB/7805 problems on Sanguinololu 1.3a - 11 years ago
OK. I've got a couple of standard diodes but the forward voltage is about 1V. Is that too much? By "problem not solved" I mean it is still burning hot, even without USB connected. I did cut the trace near the USB and now I need the 12V supply to connect. I cut the ´first´ two trace lines, same as @enif. Worth mentioning is that I just fixed a damaged pin at the ATmega chip by remapping the thermiby floppy - Sanguino(lolu)
Re: My mods for curing 5V USB/7805 problems on Sanguinololu 1.3a - 11 years ago
I cut the trace from USB 5V but the problem was not solved. Do you guys know why? Can i still try your solution or did I mess it up? Does it have to be Schottky diodes? What spec am I looking for? ...so many questionsby floppy - Sanguino(lolu)