HP-21 Circuit Diagram Schematic - Printable Version +- HP Forums (https://archived.hpcalc.org/museumforum) +-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html) +--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html) +--- Thread: HP-21 Circuit Diagram Schematic (/thread-33856.html) |
HP-21 Circuit Diagram Schematic - Gordon Dyer - 05-12-2003 I have found a circuit diagram for the HP-21. I don't know if it is accurate but it is worth a look if you are interested. Re: Any Intewrest? HP-21 Circuit Diagram Schematic - Gordon Dyer - 05-13-2003 Was anyone interested? I downloaded it... - Vieira, Luiz C. (Brazil) - 05-13-2003 ... but missed the "Thank you" share. It's been quite noisy, busy morning here... Thank you, Gordon; there are other good sources there. Best regards.
Luiz C. Vieira - Brazil
Re: I downloaded it... - Ellis Easley - 05-13-2003 Yes, thanks Gordon! I'm going to ohm out the common portions of my HP25 and then maybe I'll figure out a way to add the additional chips to the schematic.
It's the same one I was sent from another contributor - Vieira, Luiz C. (Brazil) - 05-14-2003 Hi, Gordon; I opened the file and I saw the additional circuit to suppress batteries when using external AC Adapter. It's the same one I was sent form another contributor. I know who is he, of course (thank you, R.) but I keep my policy of never mentioning a name associated to particular gestures before asking for permission. I know you all understand that. But I was not aware about where did it come from, and now you, Gordon, have opened the box. Thank you very much. Best regards.
Luiz C. Vieira - Brazil
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