| 摘要 |
PURPOSE:To use the demodulator at a high frequency band and to form the demodulator on a printed circuit board, by connecting the middle point of a series circuit of two capacitors connecting in parallel with a secondary coil to an input terminal. CONSTITUTION:A parallel resonance circuit consisting of a primary capacitor 4 and a primary coil 5 is connected between the input terminal 1 and ground, and two capacitors 12, 13 connected in series are connected across the secondary coil 6 mutually coupled with the primary coil 5 to form a dual tuning circuit. The mutual connecting point of the two capacitors 12, 13 is connected to the input terminal 1 to lead the input signal at the primary side, allowing to operate the circuit as Foster-Seeley type frequency discriminator. |
