[time-nuts] Z3801 Power Supply Schematic

[Alex Pummer]

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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