Author Topic: Interesting RF air-core transformer construction  (Read 306 times)

Offline MRMILSTAR

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Interesting RF air-core transformer construction
« on: September 08, 2019, 06:09:40 AM »
My first tesla coil was a small VTTC. It used a commercially-made air core RF transformer for the primary coil, secondary coil, and feedback coil all combined into a single assembly. It is a Miller 4526 which is called "High Voltage RF Transformer".  I bought this one in 1969. They are no longer made. I am not sure what the intended use was. Possibly it was used in place of a flyback transformer in some TVs but that is only speculation. Coincidentally this part has all three of the coils that you need to construct a small VTTC.

I have attached some pictures of its construction which I find very interesting. Notice the winding method used for the various coils. All 3 coils use an overlapping zig zag pattern in their windings to reduce stray capacitance. The secondary coil uses a stack of separate winding sections with space between them to prevent the HV from arcing between turns. An arc suppression shield can be seen between the top of the secondary coil and the feedback coil. The entire coil assembly is about 6 inches high.

« Last Edit: September 10, 2019, 10:44:34 PM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

High Voltage Forum

Interesting RF air-core transformer construction
« on: September 08, 2019, 06:09:40 AM »

 


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