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Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
If leakage is important, don't use phenolic material as base. The base will leak more than the diodes very easily. Fiberglass, or an acrylic plate, are much better.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Proud Mary wrote ...
I'd feel uncomfortable about the diodes actually touching in Gen 3.
Anything that could facilitate tracking - including salty fingerprints - should be avoided.
Ok, I trust your experience and judgment Proud Mary. Another 0.1 inches will be added to each diodes place, then they wont touch.
Antonio wrote ...
If leakage is important, don't use phenolic material as base. The base will leak more than the diodes very easily. Fiberglass, or an acrylic plate, are much better.
Really can anyone confirm this? Ive seen Del High Voltage and others use circuit board material to 100kV and more.
Grenadier wrote ...
This works too people
This is excellent work, but for a 20kV square wave id need 20 diodes at 0.4 inches each, then for a derating factor of 50% would yield a diode 16 inches long. Too long.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Patrick wrote ...
Antonio wrote ...
If leakage is important, don't use phenolic material as base. The base will leak more than the diodes very easily. Fiberglass, or an acrylic plate, are much better.
Really can anyone confirm this? Ive seen Del High Voltage and others use circuit board material to 100kV and more.
I wonder if Antonio means phenolic paper laminates like 'Paxolin' which is used in some inferior boards. Sparks jump at the chance of burning a track in it.
PCB like FR-4 has a dielectric breakdown rating of 20 kV/mm.
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Putting many diodes in series for a HV diode.
