The UI amplifies the sound emitted by the condenser microphone. Resistor R1 acts as a limiting current. When R2 and R3 center the amplified output 1/2 B+, the single-ended output is allowed to be used. The outputs of the rectified U1 of the diodes D1 and D2, and C3 filter the resulting pulsed direct current. Impression alarm circuit:
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