Portable HV PSU               GW4RWR 

 

Summary
This was built in 2011 to supply high voltage to any triode amplifier that I should ever be so adventurous as to attempt to operate /portable. It's a welded steel box with hammerite-finish and aluminium front panel.

Front panel switches are for power and 'soft start'- 30ohms in series with the mains input.

The volt meter is 100uA fsd, the ammeter is 1mA fsd.

The Patridge transformer, ex Pye UHF TV Transposer, is marked 3500V 675mA. A little transformer, ex-cassette-recorder, provides ~14V power for the backlights, which are daisy chained LEDs and the soft start relay. The capacitor bank is 12 x 440V 450uF, (thanks to SM7OVK for these).

HV out is on a C-type socket. I'm getting tired of flashovers in the C-type plugs. They seem to be good up to about 3.5kV. Anything more and it's all over. Once the connector's sooted up, it can't be reused. What does everyone else use to carry HV? I'm tempted to hardwire between amp and psu. Negative return is on SO-239.

 


Conclusion
The weight will be measured next time that I take the car to a weighbridge. It's a little heavy for a one man /P expedition.