Bill wrote:
A switching regulator without the steep (and noisy) transients of today's switchers.
Well, don't get too giddy about how quiet the scheme is <smile>. HP warned that if you use the same 12v (nominal) power supply for the oven control and crystal oscillator circuits, you need to add extra filtering to the oscillator power line to avoid injecting switching noise into the sensitive oscillator circuitry.
I always use separate voltage regulators for the oven control and crystal oscillator circuits when I build a 10544 or 10811 into a project, and I have modified HP instruments by adding an additional regulator for the oscillator section when they had 10544s installed, to good effect. Even then, a small amount of switching noise is induced into the oscillator section internally to the 10544.
That said, it is a simple and robust system that performs quite well in general.
Best regards, Charles _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
