5
OTHER FEATURES
AUTO ON/OFF
This amplifier features an automatic on/off circuit that allows the user to set up once and forget it. With the
power switch in the “AUTO” position, a switching circuit consisting of U1D, U5A, & U5B, senses an input signal.
From this switching circuit, JFET Q100 on the power amp board is biased OFF which removes the grounding of the
signal. For the protection of the speaker when the amplifier is first plugged in, there is a short delay before JFET
Q100is biased OFF. The sensing circuit will bias Q100 ON after the input signal is absent for approximately 15
minutes or more which shorts the signal path to ground. With the power switch in the “ON” position the signal
sensing circuit is bypassed and Q100 is always turned OFF. A bi-color LED indicates the status of the amplifier at
any given time. The LED will be GREEN when the control circuit is activated and RED when in sleep mode.
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