11. For a parallel resonant circuit the opposite applies; small inductances reduce the damping of external circuitry. 12. The English engineer William Duddell discovered how to make a resonant circuit using a carbon arc lamp. 13. Stubs are a kind of resonator, and the lumped element equivalent is an LC resonant circuit . 14. The sudden current through the spark gap causes the primary resonant circuit to ring at its resonant frequency. 15. A resonant circuit will respond strongly to a particular frequency, and much less so to differing frequencies. 16. In this case the lumped-element equivalent is series LC resonant circuits in series with the line. 17. The size and type of the material encapsulating the cavity can drastically impact the performance of the resonant circuit . 18. The classical varactor parametric oscillator consists of a semiconductor varactor diode connected to a resonant circuit or cavity resonator. 19. Unlike the inductive fields around the resonant circuit , this " radiated field " never comes back! 20. The parametron is essentially a resonant circuit with a nonlinear reactive element which oscillates at half the driving frequency.
