| 摘要 |
Output terminal(17), at which the AFT voltage appears, is connected to the base of a transistor(Q12) which, together with a transistor(Q13), forms a differential amplifier(24). The common connection point between the emitters of transistors(Q12,Q13) is connected to the transistor(Q14) which serves as a constant current source. A reference voltage equal to reference voltage is obtained by dividing the voltage from voltage source(+VCC) with resistors(25,26) and is supplied to the base of transistor(Q13). The differential outputs from differential amplifier(24) are amplified by a DC amplifier(27) which is formed of transistors(Q15,Q16,Q18) and a diode(Q17). The collector of transistor(Q18) is connected to the base of transistor(Q12). of differential amplifier.
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