Circuit and method for providing an auto-off capability for a wireless transmitter

A power saving auto-off circuit for a wireless transmitter for an audio source, said auto-off circuit comprising:

• a field effect transistor (FET) adapted to pinch off charge carriers when said auto-off circuit is in an “off” state;
• a capacitor connected to said FET and adapted to be charged and discharged, and if not discharged will charge to a pre-determined threshold causing said FET to pinch off;
• a comparator connected to said capacitor and having an open drain output and an input, said input adapted to be dropped in value below a pre-determined threshold limit when presented with an audio peak, and wherein said drop in value causes said capacitor to discharge;
• regulator means for producing an output when supplied with power, said regulator means connected to said comparator and enabling said comparator output to discharge said capacitor;
• and
• switch means connected to said capacitor and adapted to discharge said capacitor when activated to cause said FET to supply power to said regulator.