A device for adding and subtracting two signals. Scheme, description

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A device for adding and subtracting two signals. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Radio amateur designer

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The device, the schematic diagram of which is shown in the figure, allows you to add and subtract two signals. It can be used in stereo and quad equipment.

Device for adding and subtracting two signals

The input signals are fed to the bases of transistors T1 and T2. The operating modes of the transistors are determined by the voltage dividers R1R2 and R3R4. Transistor T1 is connected to the collector circuit of transistor T1. If the resistances of the resistors R5 - R8 are equal, output 1 will have a negative voltage equal to half the sum of the input voltages. The second output will have a negative voltage equal to the difference between the input signals.

When applying the same signals to both inputs, there should be no voltage at the second output. If this doesn't happen. then you need to select the resistor R8.

When using the elements indicated in the circuit diagram, signals with an amplitude of up to 1,4 V can be applied to both inputs.

In the device, instead of transistors BC109, you can use KT312 or KT315.

Literature

"Wireless World" (England), 1971, July

Publication: N. Bolshakov, rf.atnn.ru

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