Search found 27 matches

by Lostgallifreyan
Sun Nov 21, 2021 7:33 pm
Forum: Hardware
Topic: Lithium polymer batteries.
Replies: 10
Views: 387

Re: Lithium polymer batteries.

I looked for pictures of innards and saw that there are lots of different types now. Lots of demands for different support too. Can't ever get a consistent spec for a lithium PP3 that way, so it's a minefield. We have to narrow the field a LOT, but the main base is the voltage of two SERIES cells, f...
by Lostgallifreyan
Tue Nov 16, 2021 7:20 pm
Forum: Hardware
Topic: Lithium polymer batteries.
Replies: 10
Views: 387

Re: Lithium polymer batteries.

The EBL PP3's I described in my first post don't have a boost circuit, they decline slowly. The one I lost, then later found in a Maplin kit box, had declined to about 6V, so it's probably safe to assume that this low a voltage, after so long a decline, might give far better warning than an alkaline...
by Lostgallifreyan
Tue Nov 02, 2021 3:06 pm
Forum: General
Topic: Visual art interventions on Psion Organizer
Replies: 10
Views: 13240

Re: Visual art interventions on Psion Organizer

They look very good. The gallery shows rings that suggest they have an ability to handle very complex 3-dimensional shapes. Most laser-etching systems I'd heard of before were based on plane surfaces. If the thin aluminium panels used on Organisers can be made and painted, then further work using la...
by Lostgallifreyan
Tue Nov 02, 2021 1:39 pm
Forum: Hardware
Topic: Lithium polymer batteries.
Replies: 10
Views: 387

Re: Lithium polymer batteries.

Avoid the expensive one! Not just because it's expensive, either. They want you to remain trapped into using their charger! They could hide a multitude of sins in an arrangement like that. I'm not saying they are, and I certainly don't want to libel anyone so I won't. The better approach is to go wi...
by Lostgallifreyan
Mon Nov 01, 2021 6:05 am
Forum: Hardware
Topic: Lithium polymer batteries.
Replies: 10
Views: 387

Re: Lithium polymer batteries.

I did once try to charge in-place in an Organiser, with a method shown in detail in the image here "Failed charge line.jpg". That should have worked, with an LED to indicate charging current present, a diode to block DC in case the LED failed, and a 2.2K resistor to limit current to a leve...
by Lostgallifreyan
Mon Nov 01, 2021 5:31 am
Forum: Hardware
Topic: Lithium polymer batteries.
Replies: 10
Views: 387

Re: Lithium polymer batteries.

That must have been a royal pain! I hope the new ceiling had panels to make it relatively indestructible when stopping the thing. I found my lost battery, it was in a small Maplin project box. And it was at 8.0V so fine, which is good because it had been in there for at least two years and probably ...
by Lostgallifreyan
Sun Oct 31, 2021 9:19 am
Forum: General
Topic: Visual art interventions on Psion Organizer
Replies: 10
Views: 13240

Re: Visual art interventions on Psion Organizer

I can't see it. It looks as if you'd posted an image but the forum didn't render it, just a name 'Image.gif' in plain text.. It occured to me yesterday that the wrap-round metal layer on an Organiser might be awkward for even a laser system, unless done flat, then added to the Organiser case afterwa...
by Lostgallifreyan
Sun Oct 31, 2021 8:40 am
Forum: Hardware
Topic: Lithium polymer batteries.
Replies: 10
Views: 387

Lithium polymer batteries.

I mentioned in another post, the use of rechargeable LiPo (Lithium polymer) batteries in a Psion Organiser II, and while I think there's a good chance that people still using organisers know enough to make best use of them, it's worth making a detailed explanation for this battery choice. Lithium ba...
by Lostgallifreyan
Sun Oct 24, 2021 7:00 pm
Forum: General
Topic: Visual art interventions on Psion Organizer
Replies: 10
Views: 13240

Re: Visual art interventions on Psion Organizer

Those are impressive. How do you do them? Laser etching with blue diode light and a galvanometer? By hand? Either way the precision is amazing.
by Lostgallifreyan
Sun Oct 24, 2021 6:33 pm
Forum: General
Topic: Introduction
Replies: 2
Views: 248

Re: Introduction

I agree about the amazing battery life. For a 9V device it's really amazing that they did thirty years ago what most modern engineerign drops to 3.3V, or even 1.2V, to acheive. For detailed note-taking I don't like using them, but for logging terse notes with automatic timestamps they are hard to be...