 Tesla 811 cap risc
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Herr Zapp
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Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
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Patric -
Although ceramic capacitors may work in this circuit, a much better choice would be a mica transmitting capacitor, or an "MMC" assembled from a number of smaller mica or polypropylene-dielectric capacitors. The problem with standard DC filter ceramic capacitors is that they heat up when used in a RF circuit, and the capacitance value changes significantly as they warm up (temperature coefficient) . This "detunes" your tuned tank circuit, and degrades coil performance. Mica or polypropylene capacitors have a much lower dielectric loss factor, and do not heat up nearly as severely as ceramic DC filter capacitors.
Herr Zapp
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