A fourth terminal of the 2N4868 is internally coupled to the metal cover of this FET and must be grounded for shielding. All resistors are 0.5 watts and electrolytic capacitor C3 is rated at 25 dcwv. ![]() This relates to a maximum signal input of 15 mV rms for an output of 1.5 V rms before output-peak clipping. Through the usage of 2N4868 FETs (Q1 and Q2), the circuit provides maximum voltage gain of 10 per half. Separate gain controls (1 MΩ potentiometers R1 and R2) are supplied, and the resistances of these controls can be elevated to 5 MΩ each if a higher input impedance is required. Similar to the bipolar-transistor circuit, it supplies individual inputs and a common output. ![]() In Figure below, you can notice a traditional circuit for mixing two af signals or for choosing one or the other.
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