T-bridge in the bass amplifier. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers
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The single-transistor stage shown in the figure contains a double T-filter in the feedback circuit to provide a narrow audio bandwidth. With the nominal values of the resistors and capacitors indicated in the diagram, the device has an average frequency of 510 Hz and a bandwidth of 33 Hz, which corresponds to an equivalent quality factor Q=15.
The choice of other frequencies is made by changing the capacitors C1-C2. The calculation is made according to the formula:
The exact value of the average frequency in the absence of excitation is set by changing the resistance of the variable resistor R3.
The condition for good operation of the cascade is its matching with the output impedance of the signal source and the input impedance of the load. This condition is best met by a cascade on a transistor connected according to a common base circuit.
Literature
- Electronics World. 1969, No. 8
Publication: N. Bolshakov, rf.atnn.ru
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