Frequency response control circuit apparatus

DETAILED DESCRIPTION In FIG.
1, an input signal is applied on lead 10 to the base of a PNP transistor generally designated as 12 having its collector connected through a resistor 14 to a negative power source 16 and its emitter connected through a resistor 18 to ground or reference potential 20.
An output terminal 22 is connected to the collector of transistor 12.
The ends of a potentiometer generally designated as 24 are connected to the emitter, and collector terminals of transistor 12 and the wiper of potentiometer 24 is connected through a capacitor or reactance means 26 to ground 20.
In FIG.
2, an input 30 is connected to a base of a NPN transistor generally designated as 32 having its collector connected through a resistor 34 to a positive power source 36 and its emitter connected through a resistor 38 to ground or reference potential 40.
A potentiometer generally designated as 42 is connected across the emitter and collector of transistor 32 and its wiper is connected through an inductive load or reactance 44 and a capacitor 46 to ground 40.
An output terminal 48 is connected to the collector of transistor 32.
In FIG.
3, an input signal is applied on a lead 50 of an amplifier generally designated as 52 having a further input connected to ground or reference potential 54.
The amplifier 52 has first and second out-of-phase outputs appearing on leads 56 and 58.
A potentiometer or variable resistance means 60 is connected across terminals 56 and 58 and a wiper thereof is connected through a reactance 62 to ground 54.
An output 64 is provided from the amplifier circuit on lead 56.
OPERATION Referring to FIG.
1, it will be noted that transistor 12 is connected in a common emitter configuration with an emitter resistor 18 and a load resistor 14.
In this configuration as is known in the art, the resistor 18 not only stabilizes the output signals but reduces the gain.
The resistor 14 is used as a load to provide an output signal while still providing power and (depending on resistor values) voltage gain over that supplied to input 10