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1) Left channel output signal (or R-Ch output signal) is
applied to point "a" through Rl (or R2).
2) AC output signals are bypassed via Cl to ground and
do not activate the circuit.
3) Because
of the increased base voltage Ql is turned on
and the Ql collector voltage decreases. As a result, the
voltage at "d" also decreases and Q2 is turned off.
SB 2016
4) If a negative DC voltage appears at "a", this voltage
appears at "d" through Dl and D2, so that Q2 is turned off.
5) R4 and C2 have a time constant. Therefore, there is
a time delay after the power switch is turned on until the
relay closes.
6) D3 (Zener Diode) improves the switching characteristic
of Q2 and allows a quicker release of the relay when the
power switch is turned off.
Additional information including schematic and parts list are
found on the attached sheet.
