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Author Topic: Odd behavior from Ameritron Amplifier  (Read 9830 times)

jackson_r

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Re: Odd behavior from Ameritron Amplifier
« Reply #45 on: December 29, 2015, 0005 UTC »
Thank you, sir, for the advice!  No updates as of late.  The boat anchor is sitting in the corner of the office collecting dust right now as I prepare to leave on a month long trip to South America.  I'll have to get poking around when I get back.  By then those capacitors should all be well discharged.   ;D

Offline ka1iic

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Re: Odd behavior from Ameritron Amplifier
« Reply #46 on: December 29, 2015, 1611 UTC »
I use to have an insulated screwdriver where the entire length of the shaft, about 1 foot, was insulated except for the tip and at the handle there was a very heavy wire, about 20 inches long, with a huge alligator clip on it for connecting to ground.  The handle appeared to be doubled insulated.

It was great for discharging caps but I never used it for PSU's over 1KV... When I made supplies of 1KV or higher I had huge dropping resistors that would kick in on time delay relays to discharge the caps when the unit powered down.  Also I used sequencers on power up slowly... in some cases I would use variacs for power up. The variacs came in handy for gear that I just picked up and was questionable for operation.  I considered everything that came in as "questionable" in quality...

And don't get the idea that it is just high voltage that can be dangerous  I had a 24 volt supply that had a current output of 50 amps...  It had 10 @ 100,000 MF caps in parallel and that thing tossed a pair of vise grips that got dropped accidentally  on the caps connecting straps and it flew 5 feet into the air and stuck in the ceiling of my lab... It sounded like a 12 ga shot gun blast...

Point is... use great care with any PSU... never take anything for granted... EVER!

Have a great and safe New Year...
73 Vince
KA1IIC

"If you can't be anything, you can at least be annoying"

Troy, Ohio. 20m Vertical & low long wire E/W, Yaesu FT-187ND, SDRplay 2, Ratt Shack 2 meter rig, and other little bits of electronics I'm not talking about, homebrewed and otherwise... so there bleech!