Pacificware, Inc.

Santa Clara, CA 95050


Fax: 612-241-5375



recent additions


A reference design for a Next Generation USB variable power supply has just been released!


USB Variable Power Supply (Version 2)


We also recently released these designs:


USB UART Analyzer


USB Variable Power Supply


I2C Protocol Converter


USB Serial Port LED controller




At Pacificware, we're always considering applications we develop for general availability. Listed below are the most recently posted. The rest can be accessed on our Downloads page.


Computer Lockout for Kids




Serial Port Script

coming soon


Source files for these applications will be posted soon:




Periodic Power Monitor

USB Variable Power Supply


Occasionally we needed 2.8, 3.3 or 3.8 volts to power a little project while debugging firmware or hardware. Fortunately, lugging around a 15 pound BK precision DC regulated power supply forced us into a creative mood so we designed a variable mini power supply. It can supply several hundred milliamps via a USB cable from your laptop. If that isn't enough, just plug it into a USB wall adapter for more power.


Debug Board Iso


Our projects never use 5V anymore. These days, we usually require 2.8V, 3.3V or LiIon simulation from 3.6V to 4.2V. This little variable power supply covers them all.


USB Variable Power Supply Iso


A PIC16F677 is used to monitor the voltage with 100mV accuracy. Press the monitor button to monitor current with 10mA accuracy.


Debug Board Iso


The power supply is continuously adjustable from 1.7 to 4.6 volts using a simple pot. The low and high voltages are shown on the display below along with some of our most used voltages:



USB Variable Power Supply USB Variable Power Supply USB Variable Power Supply


USB Variable Power Supply USB Variable Power Supply





*The Source schematic file includes:






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