Last month I was at the UK “National” hamfest and in the flea market area a
seller had a HP 58503B for sale. It was missing the cover and power supply (AC
mains version)including mounting. However it was only £3 (<5$) so it was a
no-brainer to buy it. Research shows that PSU failure is fairly co
I put a $25 50 watt (?) Meanwell in mine and in mine and it works well. The
original power supply was made by PowerOne. They are still made...$300-$400 on
Digikey and Mouser.
My 58503B had a shorted ceramic cap across the input of one of the 15V
regulators. The cap was glowing orange with t
On Thu, 8 Nov 2018, 14:53 George Atkinson via time-nuts <
time-nuts@lists.febo.com wrote:
> Last month I was at the UK “National” hamfest and in the flea market area
> a seller had a HP 58503B for sale. It was missing the cover and power
> supply (AC mains version)including mounting. However it wa
Hi Dave,
Thanks for the info. I've already built the analogue supply and it's working
fine. It's interesting that even that 55W supply is operating near it's -15V
limit with the 58503A and the minumum load requiremen on th main +5V rail is
not quite met either.
Robert.
> On 08 November 2018 a
hOn Fri, 9 Nov 2018, 13:49 George Atkinson via time-nuts <
time-nuts@lists.febo.com wrote:
> Hi Dave,
> Thanks for the info. I've already built the analogue supply and it's
> working fine. It's interesting that even that 55W supply is operating near
> it's -15V limit with the 58503A and the minum
On Thu, 8 Nov 2018 at 21:43, Dr. David Kirkby <
drkir...@kirkbymicrowave.co.uk> wrote:
> On Thu, 8 Nov 2018, 14:53 George Atkinson via time-nuts <
> time-nuts@lists.febo.com wrote:
>
>> Last month I was at the UK “National” hamfest and in the flea market area
>> a seller had a HP 58503B for sale.
Am 14.11.18 um 18:41 schrieb Dr. David Kirkby:
On Thu, 8 Nov 2018 at 21:43, Dr. David Kirkby <
drkir...@kirkbymicrowave.co.uk> wrote:
On Thu, 8 Nov 2018, 14:53 George Atkinson via time-nuts <
time-nuts@lists.febo.com wrote:
Last month I was at the UK “National” hamfest and in the flea market ar
Gerhard is correct, the supply Dave has needs a minimum of 500mA on the main
output for correct operation according to the datasheet. I've not used this
exact supply, but others ve used that had similar minimum load specificions
would not run off-load. Typically thee lower limit is to put a boun
On Wed, 14 Nov 2018, 18:14 Gerhard Hoffmann
>
> If more than one replacement unit does not work, then it is not
>
> improbable that the switcher needs a minimum load to start.
>
There is a minimum load specified on the 5 V rail, and someone wrote above
that the GPS receiver does not meet that req
