HP Forums

Hi all,

If anyone has an interest in electronics and would like to try out the calculator project at teenix.org, I have 2 spare prototype PCBs that I can post out free of charge.

Please email the link at the bottom of the web page if you are interested.

The calculator board will emulate all 6 classic models and the HP67.

Parts are cheap and available although the 4 digit bubble LED display modules are becoming hard to find and I believe production has ceased. The circuit can also control a common 2 x 16 LCD display as well, although the LEDs look much better.

cheers

Tony

You have got an email

PM sent.

BEST!
SlideRule

I'd be more interested in the LED bubble display... the last stock I saw was at Sparkfun... but it dried out before I could order any .

I am most interested....please drop me a msg/email (The one I'd sent here didn't seem to go!)?

TomC

(06-22-2016 09:17 AM)teenix Wrote: [ -> ]Hi all,

If anyone has an interest in electronics and would like to try out the calculator project at teenix.org, I have 2 spare prototype PCBs that I can post out free of charge.

Please email the link at the bottom of the web page if you are interested.

The calculator board will emulate all 6 classic models and the HP67.

Parts are cheap and available although the 4 digit bubble LED display modules are becoming hard to find and I believe production has ceased. The circuit can also control a common 2 x 16 LCD display as well, although the LEDs look much better.

cheers

Tony

I'd be more interested in the LED bubble display... the last stock I saw was at Sparkfun... but it dried out before I could order any


The last time I looked these guys said they had stock on web page.

Pimoroni or Tronixlabs

cheers

Tony

One tiny LED display choice that's in production although quite expensive is Avago. See http://www.mouser.com/Broadcom-Limited/O...?P=1z0zlfz or http://www.mouser.com/Broadcom-Limited/O...fzZ1yzugs8 . These are 5x7 dot matrix so you can do text or custom characters too, not just numerals. You feed the dot patterns to them with synchronous serial. They are stackable end to end or above and below.

(06-24-2016 01:46 AM)Garth Wilson Wrote: [ -> ]One tiny LED display choice that's in production although quite expensive is Avago.

Of course.

1961: Avago Technologies began as HP Associates, an affiliate of Hewlett-Packard Company, supplying specialized silicon, germanium and gallium arsenide diodes for HP test systems.

http://www.ledsmagazine.com/articles/200...pdate.html

I didn't realize it was the same group.

Avago is now Broadcom, I exchanged a few emails with a gentleman that works for them, and he told me that they where part of the spin off of Agilent and in 2006 they where spun off from Agilent as Avago in 2006 and earlier this year Avago acquired Broadcom and is now known as Broadcom.

(06-24-2016 01:46 AM)Garth Wilson Wrote: [ -> ]One tiny LED display choice that's in production although quite expensive is Avago.
...
These are 5x7 dot matrix so you can do text or custom characters too, not just numerals.

An example :-)

[attachment=3692]

(source = Allschwil 2014)

cheap, but a little bulky, and who knows how many the have in stock:
http://www.bgmicro.com/pd2435-4-digit-le...emens.aspx

Trouble with these is they are meant for an 8-bit data bus, and are wasteful of pins on a typical micro. You can use a shift register to reduce the pins, but that's another part. Also, 5v part, which is also not desirable today.