ES246391A3 - An amplifier with transistors and printed circuit for telephone appliances. (Machine-translation by Google Translate, not legally binding)
- Google Patents
An amplifier with transistors and printed circuit for telephone appliances. (Machine-translation by Google Translate, not legally binding)
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An amplifier with transistors and printed circuit for telephone sets, essentially characterized by comprising a cover box that groups together the functional elements and whose shape, dimensions and materials will be suitable, which includes a double-walled and isolated acoustic pavilion, adjustable or fixed, which ensures the link between the sound emission and the microphone of the telephone headset, comprising a printed circuit and equipped with three transistor elements suitable for its purpose, two low voltage batteries, a power regulator and a loudspeaker placed following a technically calculated angle to avoid whistling and presenting the cover box two cavities that are respectively intended for the placement of the headset and micro, there being a switch between them that is put in circuit by the arm of the headset itself. (Machine-translation by Google Translate, not legally binding)
ES0246391A1959-01-071959-01-07An amplifier with transistors and printed circuit for telephone appliances. (Machine-translation by Google Translate, not legally binding)
ExpiredES246391A3
(en)
Improvements in microphones, particularly for duplex installations with speakers and microphone (Machine-translation by Google Translate, not legally binding)
Improvements in telephones provided with microphone capsule and headset with a piezo-electric crystal (Machine-translation by Google Translate, not legally binding)