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? -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -------------------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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