How do I tweak this voltage regulator? Answered
I pulled a power-board out of a 'phone charger (pic)
The transformer and bridge rectifier have been removed and it's powered from a 9V motor.
The charger says:
Input 230V~ / 50Hz / 40mA / 9.2VA
Output 7V / 300mA / 2.1VA
I'd like it to regulate to 5.0 V (for USB devices) - what do I fiddle-with?