Input switcher with mixing. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Input switcher with mixing. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Audio equipment

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When holding discos and for recording phonograms, it often becomes necessary to mix microphone signals with other inputs or inputs with each other. Signal mixing is best done at the input of an inverting amplifier. At the same time, due to the low input impedance, the decoupling of the inputs is the greatest.

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In the proposed switch, to increase isolation and reduce interference from unused inputs, a switch is used on DD2, DD3 [2]. The distortions introduced by the switch keys depend on the series-connected resistance (the less, the greater the resistance), the supply voltage and the switched voltage [1], and in this case are negligible.

The switch parameters correspond to those specified in [1]. The number of switched inputs can be increased.

If you need to mix other inputs with each other, you can enter another switch on the K561IE8. In this case, output 3 of the newly introduced switch is not used, and the control voltages from both switches are supplied through diodes of the KD522B type, combining them with cathodes at the control inputs of the switches to K561KTZ.

Any amplifier with an output voltage of at least 250 mV can be used as a microphone amplifier. To eliminate overloads when recording together with a microphone amplifier, it is desirable to use a compressor, for example, described in [3].

References:

S. Karelin. Low distortion electronic input selector. "Radio" 4/91, p.52, 53.
A. Petrov, D. Petrov. A simple generator for tuning tape recorders. "Radio Amateur" 10/91, p.31, 32.
Abroad. "Radio" 2/73, p.59.

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