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STEREO_REVERBERATION

2017-01-04 21:40  
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STEREO_REVERBERATION
Uses National LM377 dual power amplifier as driver for springs acting as mechanical delay lines. Used to enhance performance of stereo music system by adding artificial reverberation to simulate reflection and re-reflection of sound off walls, ceiling, and floor of listening environment. Amplifier has frequency response of 100-5000 Hz, with roll off below 100 Hz to suppress booming. Recovery amplifier uses LM387 low-noise dual preamp, and another LM387 provides mixing of delayed signal with original in inverting summing configuration. Output is about half of original signal added to all of delayed signal.- Audio Handbook, National Semiconductor, Santa Clara, CA, 1977, p 5-7-5-10.