1980-06-02
1982-12-14
Popek, Joseph A.
H03G 900
Patent
active
043639348
ABSTRACT:
A circuit for controlling power delivered to an audio speaker to thus control volume output of an electronic music system, maintains the input impedance seen by the driving source within a range close to the speaker impedance. The circuit comprises a ladder control network including a series resistor coupled to the speaker and a switched parallel resistor string. Preferably, the resistor string has multiple taps selectively coupled to the speaker via a multiposition rotary switch for setting incremental relative volume levels. In one embodiment the rotary switch is a single pole switch and a separate switch is employed in series with the resistor string for controlling maximum power delivery to the speaker. In an alternate embodiment the rotary switch is a two pole switch having the second pole in series with the resistor string for controlling maximum power delivery to the speaker.
REFERENCES:
patent: 2525696 (1950-10-01), Lurie
patent: 3033930 (1962-05-01), Guzskie et al.
patent: 4143245 (1979-03-01), Scholz
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