[time-nuts] 5087A Output Amp PC Boards

John Miles jmiles at pop.net
Mon Nov 28 18:32:13 EST 2011


> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-
> bounces at febo.com] On Behalf Of Pete Lancashire
> Sent: Monday, November 28, 2011 3:25 PM
> To: jfor at quikus.com; Discussion of precise time and frequency
> measurement
> Subject: Re: [time-nuts] 5087A Output Amp PC Boards
> 
> I'm thinking starting from a blank PCB would be a good approach :-)
> 
> On Mon, Nov 28, 2011 at 3:19 PM, J. Forster <jfor at quikus.com> wrote:
> > You'd have to reverse engineer those. I doubt the forms & cans are even
> > available any more.

If someone wants to start producing 5087A boards, that'd be great, but
please don't reuse the original HP design.  You can get much less noise and
much better isolation with fewer (and cheaper) parts.  A lot has been
written on the list about this over the years, and it would be unfortunate
if anyone building an isolation amp didn't review that material.

-- john






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