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AUDIO_CLIPPER_FILTER

2017-02-26 22:10  
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AUDIO_CLIPPER_FILTER
Improves seleetivity of communication receiver and prevents uncomfortablv loud volume in 500-ohm headphones. 88-mH toroid and 0.47-μF capaeitor form series resonant circuit at about 750 Hz with 6-dB bandwidth of 75 Hz. R2 and diodes form audio clipperwhose level is determined by forward conduction voltage of diodes. With ger-manium diodes for CR1-CR4 and silicon for CR5-CR6, each successive switch position boosts volume 6 dB. For low-impedance headphones, omit T1 and use 8 ohms for R2.-A, R Bloom, An Audio Clipper/Filter, QST, Aug. 1977, p 48.