USB Chargers for HP calcs
#1

Hello all.

I recall that USB chargers for Classic Series HP calcs were available. Are there USB Chargers for Woodstock and Spice series models available?

#2

From the information on this page the output from the chargers for the Woodstock series is 10vac and the output from the Spice series charger is 9vac. USB only provides 5vdc, I don't know enough about the internals of the calculators to know if this would be enough, but I suspect it isn't.


Mike T.

#3

Okay, that makes sense.

#4

Quote:
USB only provides 5vdc, I don't know enough about the internals of the calculators to know if this would be enough, but I suspect it isn't.

If the total wattage required is not higher than that provided by the USB port, the 5 volts can be raised to a higher voltage with a switching converter, with a proportional reduction in the current. This is the same mechanism a camera flash uses to generate several hundred volts from, perhaps, 6 V of alkaline batteries, or even the internal power supplies of several older HP calculator families.



Possibly Related Threads…
Thread Author Replies Views Last Post
  Gathering USB dumps for Connectivity Kit <-> 39gII communication... debrouxl 2 1,733 12-01-2013, 12:59 PM
Last Post: Marcus von Cube, Germany
  [Download] libhpcalcs: a toolkit for communicating with Prime calcs... debrouxl 13 4,611 11-18-2013, 05:22 AM
Last Post: debrouxl
  Swiss Micros calcs Mike Powell 6 2,450 10-26-2013, 05:03 PM
Last Post: Mike Powell
  Help me alert regular users to dangers to their calcs Bruce Larrabee 12 3,664 10-06-2013, 08:30 PM
Last Post: Bruce Larrabee
  USB flashing/Li-po boards patryk 6 2,579 09-08-2013, 12:31 PM
Last Post: patryk
  USB vs DVD Han 9 2,981 04-19-2013, 06:05 PM
Last Post: Robert Prosperi
  Look on Fournier pressure sensor for HP calcs Mic 0 973 04-11-2013, 12:57 PM
Last Post: Mic
  Safe charging LED HP calcs Anoop Sahal 6 2,360 03-29-2013, 09:08 AM
Last Post: Anoop Sahal
  HP Calcs & 'NUMB3RS' Matt Agajanian 1 1,169 11-11-2012, 10:07 AM
Last Post: Eddie W. Shore
  Official revival of old calcs wildpig 7 2,537 08-20-2012, 04:11 PM
Last Post: Ingo

Forum Jump: