HP-41C: +3V inner battery contact



#5

Hi everybody,

I would like to know if the +3V inner battery contact of the 41C is used by internal circuits. Can it work with +5V? Thanks!

Albert


#6

HI.

If you are mentioning the middle point between the four batteries, the contact is not used inside, it is just a bridge. The rechargeable battery pack does not have any points there, and the earlier HP41 calculators had a pair of contacts that allowed the calculator to be powered with external source. The schematics provided in one of the threads will give more info.

Cheers.

Luiz (Brazil)

#7

Hi.

About the 5Vcc, the HP41 works with 5Vcc somehow because you can use four N-size rechargeable batteries (aprox. 4.8Vcc nominal). Back to the first question, please read this thread and you'll find the link to the schematics. Check and you will see that the batteries are drawn as +Vcc and -Vcc.

Cheers.

Luiz (Brazil)


#8

Hi Luiz,

Thanks a lot for your tips. I saw the schematics and the information inside is useful.

Albert


Possibly Related Threads...
Thread Author Replies Views Last Post
  Bill Smithville NJ please contact me Don Shepherd 1 211 09-23-2012, 03:36 PM
Last Post: Bill (Smithville, NJ)
  HP-97 Key Contact Repair Adventure LHH 0 199 06-09-2012, 05:26 PM
Last Post: LHH
  aOT--Battery/battery contact care advice needed Matt Agajanian 0 246 04-24-2012, 07:35 PM
Last Post: Matt Agajanian
  Clamshell Battery Contact Repair aj04062 6 496 03-03-2012, 11:21 AM
Last Post: aj04062
  Clamshell Battery Contact Repair aj04062 11 748 02-23-2012, 08:23 PM
Last Post: aj04062
  Battery Contact Needed Fouad M. Kaadou 1 183 10-07-2011, 02:28 PM
Last Post: Paul Berger (Canada)
  3V Power Supply Lode 3 332 08-31-2011, 02:41 AM
Last Post: Marcus von Cube, Germany
  Trying to contact Luiz C. Vieira Iqbal 6 468 02-06-2011, 03:26 AM
Last Post: Alejandro Paz (Germany)
  Dave Britten, please contact me (NT) Don Shepherd 0 167 06-25-2010, 12:10 PM
Last Post: Don Shepherd
  Trying to contact Michel Beaulieu Vieira, Luiz C. (Brazil) 0 185 11-03-2009, 12:53 AM
Last Post: Vieira, Luiz C. (Brazil)

Forum Jump: