Duplex-line-amplifier

  
This circuit is a bidirectional amplifier that can amplify both signals of a duplex telephone conversation. It uses the principle of negative resistance. Obviously, such an amplifier could easily be unstable; however, you can adjust Rl for maximum amplification and the circuit will remain stable.
Duplex-line-amplifier - schematic

The LM324 op amps can be replaced with op amps that would distort less, such as the LM1558, LF412, LF353, or LF442.




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