[time-nuts] Replacement A9 boards for the HP 5065A

Bill Hawkins bill.iaxs at pobox.com
Sat Feb 24 22:26:07 EST 2018


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?

Bill Hawkins

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of
cdelect at juno.com
Sent: Saturday, February 24, 2018 5:45 PM
To: time-nuts at febo.com
Subject: [time-nuts] Replacement A9 boards for the HP 5065A


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.)



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