发明名称 |
Headset with limiter circuit |
摘要 |
Each of a pair of ear pads is provided with an electrically-operated earphone. The earphones are connected to each other by a circuit having a cord for connecting the earphones to an external audio-signal source. The circuit includes a pair of Zener diodes connected in back-to-back or opposed parallel relation to each other, and in parallel to the earphones so that if an incoming AC audio signal exceeds a predetermined value one of the diodes will fire to short the input signal, thus limiting the output (in decibels) of the earphones. A field-effect transistor is connected in series with the earphones to limit the current load thereto.
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申请公布号 |
US4224470(A) |
申请公布日期 |
1980.09.23 |
申请号 |
US19790015359 |
申请日期 |
1979.02.26 |
申请人 |
PERSSON, LEIF A. T.;LUNDIN, TORD P. |
发明人 |
PERSSON, LEIF A. T.;LUNDIN, TORD P. |
分类号 |
H03G3/04;H03G11/02;H04R1/10;H04R3/00;H04R25/00;(IPC1-7):H03G3/30 |
主分类号 |
H03G3/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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