Corby is still asleep, on the old board it was 0.5 uF and 100K now 5 uF and 10K. Who knows what HP knew in the 60`s but it works and I dought that it is critical. No where is there any fine tuning like two resistors in seriesBert Kehren
Sent from my Galaxy Tab® A -------- Original message --------From: Bill Hawkins <[email protected]> Date: 2/24/18 10:26 PM (GMT-05:00) To: 'Discussion of precise time and frequency measurement' <[email protected]> Subject: Re: [time-nuts] Replacement A9 boards for the HP 5065A Corby A time constant is calculated from R and C. If 50 milliseconds is the correct number, R for 5 mfd is 10,000 ohms. You could use an aluminum electrolytic for the capacitor. Can you tell us where the 50 ms number came from? Regards, Bill Hawkins -----Original Message----- From: time-nuts [mailto:[email protected]] On Behalf Of [email protected] Sent: Saturday, February 24, 2018 5:45 PM To: [email protected] Subject: [time-nuts] Replacement A9 boards for the HP 5065A Hi, I'm working to make some replacement A9 boards for the HP 5065A to the new style schematic. Will share the Gerber file when done. The integrator capacitor is a 1986 vintage TRW 5.0ufd 50V 10% .42"DX1.0"L axial. Of course it has an HP part number and no manufactures #. Any guess as to what type it is? Polycarbonate, polypropylene, ??????? Just wanting to find a good modern replacement for its use. (Integrator with a 50ms time constant.) Thanks, Corby _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
