This bistable and monostable Vox circuit was found in a 2002 documentation. The 556 is a double 555 and the gain adjustment of the circuit is done in P2. The circuit can be powered by 5, 6 or 12 V depending on the voltage of the relay used. An auxiliary gain adjustment is obtained in P1 and the timing in the monostable or timed operating mode made by S1 has the time set in P3.
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