This telephone interception circuit features a simple 3V amplifier that provides a clear signal through the supplied earphone bud. By adopting a high impedance input design the FK306 presents minimal loading on the telephone line.
Power Supply: 3V DC @ 20 mA (max.)
Output level adjustment via Trimmer Potentiometer
PCB dimensions: 40.1 mm X 27.9 mm X 15 mm (1.58 X 1.1 X 0.6 in.)