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Balanced Mixing Board – Single Power Supply

Overview

It uses a single power supply, built-in resistor voltage divider, and uses the dual-channel pre-balanced tuning module of the NE5532 operational amplifier. It can be
used for attenuation tuning with a pure 12v DC power supply, and is used with the operational amplifier 3.1 times the voltage gain (using 47K and 15K)
red The output

attenuation circuit of the channel all uses SMD devices, and tantalum capacitors are added to the power supply. In actual measurements, there is no noise even if no tantalum capacitors are added. The stacking should be better!

It has been improved to a SMD version, adding a boost power supply module and a lithium battery charging circuit! (2022.11.11)

Design Files

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Update:2025-06-23 08:50:22

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