| 摘要 |
1. Frequency selective, controlled, electronic amplifier circuit consisting of one of several stages and having an output for each stage which is provided by the output of a band filter (1) connected to the collector circuit of a transistor (2), whereas the controlling means of each stage is connected to the impedance (3) of the emitter of the transistor (2), which impedance (3) of the emitter circuit contains a frequency dependent element which is connected in parallel to a resistor (32) controlled by voltage, characterized in that the frequency dependent element is a member, preferably a capacitor or an in series connected RC-member, that the circuit is provided with a reference transmitter (4) and a comparing branch, in which a signal transmitter (51) connected to the output of the band filter (1), a resistor (52) with valve effect and a condensator (53) are connected in series, wherein the one end of the comparing branch is connected to the output (4b) of the reference transmitter (4), whereas the shared end of the resistor (52) and the condenser (53) is connected to the controlling end (3d) of the voltage controlled resistor (32). |
