Circuit Diagram

specification �@　4 microphone inputs, individual switching/mixed mode, input supports balanced input. �A　2 AUX inputs, VR = common, mixing of microphone signal and AUX signal. �B　Mono/stereo switching function. �C　Line output = 2 systems. �D　Headphone monitor, VR included. �E　Each microphone connector is compatible with φ6.5 stereo jack and Canon connector. When I listen to amateur radio, I often hear stories like this: "The microphone A is currently being used, I'll change to microphone B, so please report back," but the microphone never comes out, or when it does, the gain is completely different, making it very difficult to compare and test microphones. I have connected four types of microphones to this unit: condenser, dynamic, ribbon, and homemade condenser. By adjusting the phase of each microphone, you can select a total of 12 types of microphones, four types alone and eight types in mixed mode. In the first place, if you properly adjust the level (sensitivity) of each microphone amplifier to the same level and drive each microphone under the same set position conditions, there will not be a big difference. Most of the time, the biggest difference is due to differences in level or set conditions. In my experiments, microphones ranging from 980 yen to 10,000 yen are all similar.

Front	Back
internal	Circuit Board Unit

Currently used microphones

Akizuki Remote Control

In order to accurately compare microphones, it is necessary to be able to instantly switch between them while controlling the levels and usage conditions. Although it is possible to change the levels and switching conditions using the front panel, the distance between the microphone and the mouth can cause the conditions to shift when switching, giving the brain a preconceived idea. To eliminate this, a remote control function has been added. This allows you to instantly switch between the microphones while keeping the mouth position conditions the same. I