| 摘要 |
A sound communication system incorporating a triangle wave generator (TWG), a voltage controlled oscillator (VCO) and an output circuit including one or more loudspeakers. The output circuit is connected from the output of the VCO. The output of the TWG is connected to the input of the VCO to control its frequency of oscillation. The TWG can be actuated by a horn ring switch or a momentary contact switch, either of which, when closed, grounds the TWG input and causes the TWG to oscillate. A transistor switch is connected from the TWG input and a third lead from the VCO to cut off the VCO to protect the speaker(s) from damage due to low frequencies.
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