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Circuit Boards - teenix - 06-22-2016 09:17 AM

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

RE: Circuit Boards - Harald - 06-22-2016 11:48 AM

You have got an email Smile

RE: Circuit Boards - SlideRule - 06-22-2016 11:54 AM

PM sent.

BEST!
SlideRule

RE: Circuit Boards - Alejandro Paz(Germany) - 06-23-2016 02:42 PM

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 Sad.

RE: Circuit Boards - TomC - 06-23-2016 06:17 PM

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


RE: Circuit Boards - teenix - 06-24-2016 01:09 AM

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

RE: Circuit Boards - Garth Wilson - 06-24-2016 01:46 AM

One tiny LED display choice that's in production although quite expensive is Avago. See http://www.mouser.com/Broadcom-Limited/Optoelectronics/Displays/_/N-6j734?P=1z0zlfz or http://www.mouser.com/Broadcom-Limited/Optoelectronics/Displays/LED-Displays-Accessories/_/N-6j73b?P=1z0zlfzZ1yzugs8 . 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.

[Image: AV02-0699EN.jpg]

RE: Circuit Boards - Dave Frederickson - 06-24-2016 02:39 AM

(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/2005/12/agilent-semiconductors-group-becomes-avago-update.html

RE: Circuit Boards - Garth Wilson - 06-24-2016 05:49 AM

I didn't realize it was the same group.

RE: Circuit Boards - Paul Berger (Canada) - 06-24-2016 12:04 PM

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.

RE: Circuit Boards - J-F Garnier - 06-24-2016 03:48 PM

(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)

RE: Circuit Boards - quarterturn - 06-27-2016 05:21 PM

cheap, but a little bulky, and who knows how many the have in stock:
http://www.bgmicro.com/pd2435-4-digit-led-array-by-siemens.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.