Your First Handheld?
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05-08-2014, 02:00 PM
(This post was last modified: 05-08-2014 02:18 PM by Gerson W. Barbosa.)
Post: #28
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RE: Your First Handheld?
(05-08-2014 05:09 AM)Steve Simpkin Wrote:(05-07-2014 11:39 PM)Gerson W. Barbosa Wrote: These were my first, second and third (for those who can read it :-) real handhelds. Hello Steve, Yes, those were my first HP calculators, in order. The HP-15C was a replacement to a TI-59 after being stolen by a burglar; the HP-28S was acquired one year later and used for another year. The HP-42S was used only two months during college vacations. When classes returned I sold it (which I regret) and bought an HP-48G (replaced with a 48GX one week later). When the output O3 of the Johnson counter is activated, the counter is reset, so the displays cycles through the three valid calculator models. Actually, that should have been a 4.7 uF capacitor (for 1 Hz frequency) , not a 47 nF one (as far as I can remember, due to some simulator setting I wasn't able to verify the circuit until I lowered the value of the capacitor). I'm glad you liked (and solved) this little puzzle :-) Cheers, Gerson. |
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