Electrophone karaoke. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Electrophone karaoke. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Audio equipment

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In the once very famous and still preserved by many radio amateurs, the Accord electrophone can be introduced into an operating mode close to Karaoke, which is popular at various musical evenings and discos. The proposed refinement provides only the superposition of the signal from the external microphone on the reproduced phonogram, but even this is enough to obtain the desired effect. Other electrophones can be modified in a similar way.

The refinement is as follows: an additional connector X1 is fixed on the body of the electrophone (Fig. 1). Its conclusions are connected by wires (preferably shielded) to the input circuits of the amplifier. When you need to get the "Karaoke" mode, an MKE-3 electret microphone is connected to the connector, the supply voltage to which comes from the amplifier through pins 4 and 2 of the connector. Resistor R1 reduces the shunt effect of the relatively low microphone output impedance on the amplifier input circuits.

Karaoke from an electrophone

Microphone 1 (Fig. 2) was installed by the author into housing 3 of a failed MD282 microphone and fixed with screws 8 on a plastic centering sleeve. A spring clip is placed between the sleeve and adapter 7 (it is made of wood), into which a protective mesh 2 is inserted, the role of which can be played by a tea strainer.

Karaoke from an electrophone

The MKE-3 leads are shortened, and two of them are soldered to insulated stranded mounting conductors (red and white in Fig. 3), placed in a shielding braid - it is connected to the remaining microphone lead. The resulting cable 6 is led out through the hole in the wooden plug 4, having previously wound a thread bandage 5, which prevents the cable from being pulled out. At the end of the cable, the counterpart of the X1 connector is installed.

Karaoke from an electrophone

By connecting the microphone to the electrophone, the volume of the reproduced melody is set so that the accompanying speech (or singing) of the presenter is clearly audible. To avoid self-excitation due to acoustic coupling between the microphone and the loudspeaker of the electrophone, they must be separated by a sufficient distance and the spatial orientation of the microphone must be selected. In addition, it is possible to narrow the microphone's directivity pattern by wrapping its body (but not covering the microphone holes) with foam rubber 6...8 mm thick so that the resulting horn touches the protective grid.

Author: A.Nizovtsev, Moscow

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