Dont get too complex until you have a functional calculator :)
Sounds like a fun project vs my Galaga upright arcade restoration :)
I also came across some Gas Filled 4x12" Displays that are dot matrix.
They use 94V to power the Element.
On 07/21/2018 04:04 PM, Chuck McCown wrote:
Yes, I just found a source of old typewriter keys. I think I will
connect them to microswitches for a nice tactile feedback.
Analog volt meter showing the capacitor voltage. Will probably need a
voltage doubler to get up to the 180 volts needed for the nixie tubes.
Things start to dim, crank the crank a few turns.
Do I want to use cloth covered wire and solder terminal sockets. At
some point PCBs will have to be used. So I will probably get lazy and
make a PCB for everything.
Be fun to have some kind of mechanical annunciator showing the sign of
the exponent.
Prepper calculator. (Probably a raspberry pi in its heart).
Maybe use a telephone ringer bell to announce the result. I could add
some delay with the nixie tubes scrolling through the digits and one
by one stopping on the digits of the solution.
*From:* Chuck Macenski
*Sent:* Saturday, July 21, 2018 2:50 PM
*To:* [email protected]
*Subject:* Re: [AFMUG] OT Nixie tubes
Old silver and black typewriter keys. Think Enigma machine...
On Sat, Jul 21, 2018 at 3:28 PM Chuck McCown <[email protected]> wrote:
I must be nuts.
I am working on a calculator project that uses nixie tubes for a
display.
I want to use a telephone magneto to charge up a cap to run the
thing.
Kinda a steam punk RPN HP type of calculator.
I am stuck on what to use for buttons. I am thinking elevator
buttons.
Large oak case. Just crank it for 10 seconds and then do your
calculation.
I am also conflicted as to how many buttons.
Square and square root for sure.
Undecided about log, trig functions and whether or not to have
scientific notation. I think I will.
How many digits to display? Probably 5. Engineering mode only. 3
dot 2 display.
Also considering multiple lines to show 4 levels of the stack but
I doubt I will actually do that.
The question is: will I ever finish this thing?
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