External microphone amplifier. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Microphones, radio microphones
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The circuit is a simple miniature noise-immune microphone amplifier used when using electret microphones. One of the advantages of the circuit is the ability to use a two-wire cable (screen and wire) to connect to the ULF (which is connected via the K1-K2 connectors).
The gain at these ratings is about 100. You can change the gain of the device using the resistance R1.
The scheme allows you to take out the X1 capsule at a distance of up to 5 meters (using a shielded cable). The selection of the exact parameters for direct current for the capsule X1 is carried out using the resistance R3 in accordance with the requirements for the capsule. Typically, the constant voltage on the capsule should be in the range of 3-4 V. If you intend to use a three-wire connection, there is no need to install connectors K1.
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