op amp Could someone help me understand this simple circuit


Posted on Feb 5, 2014

The circuit is shown in receive mode, PTT switches to transmit, the speaker serves as a microphone and speaker. All systems I`ve seen use a Rocking Armature Transducer for the speaker. There is no base station or similar - you can just connect two or more of these to the same wire and use them.


op amp Could someone help me understand this simple circuit
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