Control circuit
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United States of America Patent
Stats
-
Oct 20, 1987
Grant Date -
N/A
app pub date -
May 6, 1985
filing date -
May 24, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automatic gain control circuit for an output signal of a magnetic earpiece of a hearing aid, which comprises a voltage source, an output amplifier stage having an input connected to the voltage source and an output connected to the magnetic earpiece, the earpiece having a working winding connected between the amplifier stage output and the voltage source, and a control loop for automatic gain control. The control loop includes a rectifier and an additional winding connected in series with the working winding of the earpiece, the windings constituting an autotransformer, the additional winding connecting the rectifier to the output of the amplifier stage and the rectifier being connected to the input of the amplifier stage.
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Family
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