[time-nuts] Z3801 Power Supply Schematic

[paul swed]

It is a complex circuit and much can be replaced with simpler supplies.
Bad inverter simply change it out to something else...
But the reason its so complex is that it worked in very harsh environments
and generally on a battery backup system with a fairly wide range of
voltages. It would have had to meet Telco NEBs and ETSI behaviors.
Generally we don't need those levels.
Regards
Paul
WB8TSL

On Wed, Apr 24, 2019 at 12:03 PM Alex Pummer <alex at pcscons.com> wrote:

> Hi Richard,
>
> may I ask you to send to me that Schematic?
>
> thank you in advance
>
> 73
>
> KJ6UHN Alex
>
> On 4/24/2019 7:46 AM, RICHARD GOLDING via time-nuts wrote:
> > Many thanks to those who took the trouble to send me schematics of the
> Z3801a PSU.
> > I'm pleased to report that, using, the schematic, I was able to trace
> and fix the fault and that GPS lock led is glowing again.
> > The problem was a faulty regulator IC (U2 LM317) that had decided to
> produce 1.8V instead of 2.5V, which resulted in the PSU thinking that the
> input supply voltage was out of range.
> > It does seem a very complicated circuit for what could be
> straightforward voltage window comparator. i.e. 24R's, 8 Diodes, 3
> regulators, a comparator and logic IC + a handful of Mosfets!
> > Thanks again for those that helped.
> > 73 Richard, G3VZG
> >
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