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Safety Practices, General and Ultra-High Voltage
Safety Practices, General and Ultra-High Voltage
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Old 30th March 2019, 07:50 PM   #381
bluerooster is offline bluerooster
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In the HV supply for my RF amp, there are 8 450v caps in series with a resistor accross each cap.
Those resistors serve well as bleeders. when turned off, the voltage drops from 2kv to zero in about 45 seconds. Then I take my "chiken stick" and insure that they are fully bled off. The "chikin stick" consists of a 2.5 foot phenolic rod with a 25k resistor at the end. It has served me well over the years.
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Old 30th March 2019, 08:44 PM   #382
GoatGuy is offline GoatGuy  United States
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I take it that your chicken stick has a 25 kΩ, 5 watt resistor taped to the end, both leads bent outward, so that it can be placed across each 450 V (only charged to 250 V) individual capacitor?

Once, when I was a 2 KW (plate) HAM, my HV supply had a very high voltage relay that'd release when the mains power went out, engaging a bank of 47 kΩ, 10 W wire wound resistors (I think there were a dozen of them) to discharge the 4 KV supply capacitors. Worked quite effectively. Whether you clicked the power switch off or not, the loss of mains power immediately engaged the bleeder bank. Likewise, when mains power was restored, the bleeder would cut out automatically.

Just saying,
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Old 30th March 2019, 08:59 PM   #383
kevinkr is offline kevinkr  United States
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Safety Practices, General and Ultra-High Voltage
The "chikin" sticks I've seen (or made) had a resistor at one end with a wire that you connect to the internal power/chassis ground. You connect the ground and touch the resistor to any points that may still have a potential on them. Follow up with an appropriately rated and insulated DVM afterwards to be sure.
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Old 31st March 2019, 11:55 AM   #384
bluerooster is offline bluerooster
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Quote:
Originally Posted by kevinkr View Post
The "chikin" sticks I've seen (or made) had a resistor at one end with a wire that you connect to the internal power/chassis ground. You connect the ground and touch the resistor to any points that may still have a potential on them. Follow up with an appropriately rated and insulated DVM afterwards to be sure.
Yep, that's it.
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Old 2nd April 2019, 03:16 PM   #385
kodabmx is offline kodabmx  Canada
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Safety Practices, General and Ultra-High Voltage
I've use these Keystone strips at 600VDC and they work perfectly well...

829 Keystone Electronics | Connectors, Interconnects | DigiKey
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Old 9th May 2019, 12:39 PM   #386
kees52 is offline kees52  Netherlands
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This is a c lever idea, nice reading.

High Voltage can kill you when flow through the heart.

Residual current devices (RCDs) and Ground fault interrupters (GFIs)

regads
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Old 25th August 2019, 11:06 AM   #387
Rewind is offline Rewind  Sweden
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Safety Practices, General and Ultra-High Voltage
When the livingroom turned into a playroom, something had has to be done to hide the intruiging tube amps, and other lidless projects.
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Old 26th August 2019, 06:03 AM   #388
Lampie519 is offline Lampie519  Netherlands
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A dog run thru my amp the other day (i was demonstrating the amp at a friends house) when someone opened the front door. He got so exited, as dogs can get, and kicked out some tubes. Luckily the amp was not powered at that moment. I like hot dog but not in this way.
A lesson learned!
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Old 23rd September 2019, 03:54 AM   #389
opcom is offline opcom  United States
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opinions and some levity
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Old 25th September 2019, 08:42 AM   #390
Shef is offline Shef
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