Signal amplifying circuit used for satellite voice frequency
The invention relates to a signal amplifying circuit used for satellite voice frequency. The signal amplifying circuit comprises a transformer, an NPN triode and an adjustable inductor, wherein one end of the primary side of the transformer is connected with an antenna coil, the other end of the pri...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention relates to a signal amplifying circuit used for satellite voice frequency. The signal amplifying circuit comprises a transformer, an NPN triode and an adjustable inductor, wherein one end of the primary side of the transformer is connected with an antenna coil, the other end of the primary side of the transformer is connected with a positive electrode of a power source, a capacitor C1 and a capacitor C2 are connected in parallel on the primary side of the transformer, a negative electrode of the power source is connected with a negative electrode of an earphone through a resistor R2, one end of the secondary side of the transformer is connected with the negative electrode of the earphone through a resistor R1, the other end of the secondary side of the transformer is connected with a base of the NPN triode, a collector of the NPN triode is connected with a positive electrode of the earphone through the adjustable inductor, an emitter of the NPN triode is further connected with a diode D1 and a d |
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