19
INPUT BUFFER AMPLIFIER
The integrated circuit, U3, provides several functions. U3A is used as an input buffer amplifier
which isolates the source signal from deterioration caused by the user selectable DIP switches,
SW1A.,B,AND C. The resultant gain of U3B will vary depending upon which DIP switches are
enabled. The final composite signal on pin 7, U3B, is sent to coupling capacitors C4 and C26
which provide access to the low and high frequency processing circuits, respectfully.
Input = 0 dB/2.2 Vpp
@ 100 Hz
Out
ut= 1.1 V
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