A "squelch" or silencer is a circuit that causes the amplifier signal is cut when there is someone talking, it prevents that wheezing that occurs in speakers when there is no one talking, or receiving the message. The circuit shown in this article does this.
The silencers are connected between the detector and the volume control of a communications receiver. The point of the setting in which it must act, that is, the signal level between the noise threshold and the voice of the person speaking in the received signal is adjuested by the pot.
The circuit makes use of a double tube, 6U8 consisting of a triode-pentode.
Power is taken from the receptor itself, being made with voltages between 200 and 300 V.
The components used are common except the valve and there is no transformer as the power comes from the device itself that it should work under low current regime. The full diagram of the muffler shown in figure.
