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HP Forum Archive 19

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HP-41 in the dark; A home made Porta-Lite
Message #1 Posted by Geir Isene on 19 Sept 2010, 4:12 a.m.

Some time back, you guys asked for a picture of the little hack I did when I made a LED module for my 41.

Here are the details and pics

      
Re: HP-41 in the dark; A home made Porta-Lite
Message #2 Posted by Paul Dale on 19 Sept 2010, 5:02 a.m.,
in response to message #1 by Geir Isene

Isn't this a little bit wasteful of the expensive N cell batteries :-)

Otherwise, a nice mod.

- Pauli

            
Re: HP-41 in the dark; A home made Porta-Lite
Message #3 Posted by Geir Isene on 19 Sept 2010, 8:51 a.m.,
in response to message #2 by Paul Dale

As long as I can get hold of a refurbished rechargeable battery pack, I'll be fine (tried to make one, bot a botched-up soldering job led me to place a WTB-ad in the classifieds section).

      
Re: HP-41 in the dark; A home made Porta-Lite
Message #4 Posted by Brian Walsh on 20 Sept 2010, 1:36 a.m.,
in response to message #1 by Geir Isene

What a flashback. Tom Hooper made and sold the Port Lite (or was it the Port-X-Lite?) back in the early 80s for the 41. It had a switch on the exposed side of the module. Mine is buried away in a box somewhere.

            
Re: HP-41 in the dark; A home made Porta-Lite
Message #5 Posted by Raymond Del Tondo on 20 Sept 2010, 3:26 a.m.,
in response to message #4 by Brian Walsh

Yes, that one had been offered to me back in the early eighties by my favourite HP dealer, Buero Hansen in Bonn, Germany, for those who remember;-)
I should have bought at least one unit, but back then I had to save some money for my first X-Functions module...
Later, when I had some spare funds for toys, the lites weren't available anymore.

      
Re: HP-41 in the dark; A home made Porta-Lite
Message #6 Posted by Alejandro Paz (Germany) on 20 Sept 2010, 11:03 a.m.,
in response to message #1 by Geir Isene

I thought it was a LED display :(

            
Re: HP-41 in the dark; A home made Porta-Lite
Message #7 Posted by Diego Diaz on 21 Sept 2010, 3:09 p.m.,
in response to message #6 by Alejandro Paz (Germany)

Nice gadget. I also recall the referred unit from the eighties...

Just some thoughts from the HW side of my brain:

-Is its power connected to the BAT or to the +V line in the module? (I would recommend the BAT since the +V will load the DC/DC converter chip with some unnecessary extra mAmps)

Just my two cents... :-)

Best wishes from the Caribbean Sea.

Diego.

Edited: 21 Sept 2010, 3:21 p.m.

                  
Re: HP-41 in the dark; A home made Porta-Lite
Message #8 Posted by Geir Isene on 21 Sept 2010, 3:26 p.m.,
in response to message #7 by Diego Diaz

Damn, I'd have to do a take3 then ;-)

                        
Re: HP-41 in the dark; A home made Porta-Lite
Message #9 Posted by Diego Diaz on 22 Sept 2010, 7:13 p.m.,
in response to message #8 by Geir Isene

Ha, ha... upgrades, upgrades, upgrades...

You've just entered the HW geeks weird word... mind your step :-)

Mail me if you thing I can be of any help with this.

Best wishes.

Diego.


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