tapped coil การใช้

They're also relatively easy to control, electromechanically using tapped coils, or electronically.
Impedance bonds are essentially centre-tapped coils, which offer low impedance to traction current at say 50 Hz, while offering high impedance to signalling current at say 1.7 kHz.
Changing the tapped coil to two separate coils, as in the original patent schematic, still results in a working oscillator but now that the two coils are not magnetically coupled the inductance, and so frequency, calculation has to be modified ( see below ), and the explanation of the voltage increase mechanism is more complicated than the autotransformer scenario.
A quite different implementation using a tapped coil in an LC tank feedback arrangement is to employ a common-grid ( or common-gate or common-base ) amplifier stage, which is still non-inverting but provides " voltage gain " instead of " current gain "; the coil tapping is still connected to the cathode ( or source or emitter ), but this is now the ( low impedance ) input to the amplifier; the split tank circuit is now dropping the impedance from the relatively high output impedance of the plate ( or drain or collector ).