In this circuit, intercom, an 8-ohm is used for both the microphone and output device. Phase BC109C extends a common base mode, in which case a good voltage gain, while providing a low input impedance of the speaker. Self-DC bias is used allowing increases of transistors in progress. LM386 is used in inverting mode amplifier power to increase the voltage gain and drives 8 ohm. 10k potentiometer volume control works, and the overall benefit can be adjusted using the 5k in advance. Double-pole switch, turn the position of the speakers, so you tend to speak and another to hear. Manually operate the switch (from inside the house) allows two-way communication.
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