Power sources

General discussion about calculators, Swiss Micros or otherwise
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Yorkie
Posts: 1
Joined: Thu May 14, 2020 11:15 am

Power sources

Post by Yorkie » Thu May 14, 2020 6:46 pm

Does anyone know of a small power bank that does not cut out when it senses the low power draw of the DM42?

hoverbeek
Posts: 17
Joined: Sat Sep 21, 2019 3:54 pm

Re: Power sources

Post by hoverbeek » Thu May 21, 2020 4:49 pm

Why would you want that?

The DM42 does hardly draw any power. So the battery lasts for years.
I am still on my factory delivered battery.

Expect to change the battery once every few years.
DM41X SN: 00070 DM42 SN: 00754
HP35, ..., HP67, HP41(C,CV,CX), ..., HP48GX, ..., HP33S, HP35S, WP34S, WP43S

EM41
Posts: 132
Joined: Mon Mar 30, 2020 12:10 am
Location: Overijssel Netherlands

Re: Power sources

Post by EM41 » Thu May 21, 2020 5:14 pm

I have an old 2500mAh Xtorm powerbank for the DM41X, never tested with the DM42.
Mainly for use in the train when I want some more speed than with the built in battery.
Maybe the newer models are more intelligent and cut out with low power drain but the old one works well.
HP41C (2x), HP41CV, HP41CX, DM41X β, DM41X, DM42, HP11C, HP48G, HP97

dlachieze
Posts: 245
Joined: Thu May 04, 2017 12:20 pm
Location: France

Re: Power sources

Post by dlachieze » Thu May 21, 2020 5:15 pm

Yorkie wrote:
Thu May 14, 2020 6:46 pm
Does anyone know of a small power bank that does not cut out when it senses the low power draw of the DM42?
Voltaic Systems is making such power banks with Always-on mode.
There may be other manufacturers.
DM42: 00425 - DM41X: β00066

hoverbeek
Posts: 17
Joined: Sat Sep 21, 2019 3:54 pm

Re: Power sources

Post by hoverbeek » Thu May 21, 2020 5:52 pm

The DM41X has the same hardware as the DM42.
DM41X SN: 00070 DM42 SN: 00754
HP35, ..., HP67, HP41(C,CV,CX), ..., HP48GX, ..., HP33S, HP35S, WP34S, WP43S

grsbanks
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Location: Preston, Lancs, UK
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Re: Power sources

Post by grsbanks » Thu May 21, 2020 9:11 pm

hoverbeek wrote:
Thu May 21, 2020 4:49 pm
Why would you want that?
To boost the speed, maybe?

If the DM42 is powered by USB, the CPU's clock gets bumped up from 25MHz to 80MHz.
There are only 10 kinds of people in the world: those who understand binary and those who do not.

cdmackay
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Joined: Fri Oct 05, 2018 8:33 pm
Location: Cambridge, UK
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Re: Power sources

Post by cdmackay » Thu May 21, 2020 10:26 pm

hoverbeek wrote:
Thu May 21, 2020 4:49 pm
Why would you want that?

The DM42 does hardly draw any power. So the battery lasts for years.
I am still on my factory delivered battery.

Expect to change the battery once every few years.
One reason to use a power-bank might be if you want the faster operation whilst running from USB power?

My naive use doesn't need that, but others' might :)

edit: sorry, Godwin, beat me to it :)
Cambridge, UK
41CL/DM41X 12/15C/16C DM15/16 71B 17B/BII/bII+ 28S 42S/DM42 32SII 48GX 50g 35s 30b/WP34S Prime G2
& Casios, Rockwell 18R :)

hoverbeek
Posts: 17
Joined: Sat Sep 21, 2019 3:54 pm

Re: Power sources

Post by hoverbeek » Fri May 22, 2020 12:50 pm

Ok, faster operation makes sense!
DM41X SN: 00070 DM42 SN: 00754
HP35, ..., HP67, HP41(C,CV,CX), ..., HP48GX, ..., HP33S, HP35S, WP34S, WP43S

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