Noise-limiter

  
This circuit is fed from the earphone jack of your receiver and goes to limiter control R6 and is then amplified by Ql: a common-emitter stage that has a voltage gain of only about 10, because of the negative feedback introduced by R3. The output of Ql is fed to a simple clipping circuit, consisting of diodes D1 through D4. The diodes, connected in pairs, act like Zeners with an avalanche rating of aboun V.
Noise-limiter - schematic

The two pairs are connected opposite in polarity to each other, so that the audio signalis clipped at about 1 V. The signal is then coupled to the output socket through an emitter-follower buffer stage built around QZ and an output attenuator control R7.




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