Sanguinololu has 2.5v on the 12v side March 23, 2014 10:04PM |
Registered: 13 years ago Posts: 100 |
Re: Sanguinololu has 2.5v on the 12v side March 24, 2014 02:28AM |
Admin Registered: 13 years ago Posts: 6,995 |
Re: Sanguinololu has 2.5v on the 12v side March 24, 2014 07:55PM |
Registered: 13 years ago Posts: 100 |
Quote
The USB 5V VBUS is connected to the output of the 5V regulator. This is bad for the regulator and bad for the PC. Some users report the regulator getting very hot (because it is trying to power the PC), other users report the PC giving USB over current errors. Nophead and Nothinman recommend cutting the 5V track to the USB connector. The only downside is the board needs the 12V supply before it will do anything, but who cares?
An alternate fix for the 1.3a board is to cut the trace between the USB chip pin 4 and C13. This is functionally identical to building a Sanguinololu without the USB port and FT232RL and using an offboard USB-serial cable. The advantage over cutting the 5V trace at the USB connector is that the USB serial port doesn't disappear from the host PC when the printer is switched off, which can anger host software that is still running.
Re: Sanguinololu has 2.5v on the 12v side August 02, 2014 08:49PM |
Registered: 9 years ago Posts: 53 |