I have some PIC18F4550s lying around, and I want to play with the USB features of this chip, therefore I made this breakout board. It contains enough components to get the PICMicro running, and nothing more, all the pins are routed to pin-headers to use with an experimenter board.
- ICSP connector (In-Circuit Serial Programming, AKA PicKit 2 & 3)
- USB-B Connector
- 20Mhz clock crystal
Eagle files: PIC18F4550 USB ICSP breakout board
I have built and tested, the revised version of, both the positive, and the tracking negative regulator. The new version is here:
I have not included Q12, since it was part of the original current limiting circuit. The pass transistors Q5 and Q7, are mounted off-board, on a suitable heat sink. R18 adjusts the maximum output voltage, and R17 adjusts the voltage of the negative tracking regulator.
I will do some more testing of the power supply under different load conditions, and post the results.
Generated on 2018-05-03 01:14:21.936204