I want to try to use the VOX circuit to turn on a dc motor in forward
and reverse for say, 15 sec. Then I want the output of the VOX be
isolated from the dc motor because the VOX output affected the
smoothness of the motor movement.

Any idea how to isolate the motor from the VOX circuit when motor start
running but still able to turn on by VOX when motor stop ?

The VOX circuit I am using is like this web page :-

http://www.rason.org/Projects/basicvox/basicvox.htm

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