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Doorphone Intercom
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device. The BC109C stage amplifies in common base mode, giving good voltage gain , while at the same time matching the low input impedance of the speaker. Self bias is used allowing for small variations in transistor tolerance. An LM386 is used to boost voltage
gain and drive an 8 ohm speaker. The 10k potentiometer A double pole double throw switch is used to enable talk and listen, (at the house end).
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