✔ Diy High Voltage Variable Capacitor

Diy High Voltage Variable Capacitor

- March 13, 2018

Homebrew high voltage variable capacitor for magnetic loop antenna. 96 pf voltage across tuning capacitor.

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It is very easy to get a very high capacitance and a good highlow capacitance ratio.

Diy high voltage variable capacitor. Build your own air variable capacitors. 2 x 4mm gold plated spade terminals for the main loop connections. It had a minimum of about 90 pf for a ratio of 501.

How to make high voltage capacitors homemadediy capacitors duration. 58 21 vswr bandwidth. 250pf single gang variable capacitor with reduction drive.

Plastic best choice for high voltage capacitors the plastic spork blog making it variable is another question a lot depends on the tools you have available. With only 24 plates it had about 4500 pf. I built a prototype today of a high voltage variable capacitor for the 40m magnetic loop antenna i am building.

My original plan was to make it a fixed capacitor out of a length of coax for a single 40m frequency. 2 x 4mm gold plated binding posts for the main loop connections. 75 khz a bit more reasonable but still requires about 100 pf at 5 kvrms so this is a robust capacitor.

The base design could be expanded into multi gang capacitors differential capacitors and with some modified stators even butterfly capacitors. This compares with only 15 365 pf for commercial variable capacitors of roughly the same size. Thats a great article using common hardware store goods to build an otherwise hard to find component.

If you reduce the output power to 35w then the voltage across the capacitor will decrease to 2168 v rms which is 3066 v peak 2168 x 1414 this voltage requires a 1 mm plate spacing which is easily achievable with surplus capacitors. 250cm length rg 213 coaxial cable for main loop element. The instructions i find online for mag loop antennas in particular require high voltage variable capacitors.

Posted by on august 17 2016. 47 kvrms about 67 kvp current through capacitor. Im still grappling with the theory to understand exactly what voltages are involved but tuner circuits im finding around the web also involve variable capsinductors.

G4ilo says this is a good parts list for a more permanent diy mag loop build.