| 摘要 |
An automatic gain control circuit for use with a motorcycle radio and headset features an adjustable control for setting the maximum signal allowed to reach the headset, while allowing normal signal levels below that point to be controlled at the motorcycle radio. The circuit may be easily incorporated for use with a previously installed radio as well as an enhancement for new radio designs. Isolation transformers on both the input and output of the circuit eliminate the necessity to ground the circuit. Bass boost and internal gain circuits compensate for internal losses and headphone loading characteristics to provide near-transparent signal transfer below the set maximum signal level.
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