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Other names for this product: NE571,
Courtesy/Thanks to: Philips

Description: The SA571 is a versatile low cost dual gain control circuit in which
either channel may be used as a dynamic range compressor or
expandor. Each channel has a full-wave rectifier to detect the
average value of the signal, a linerarized temperature-compensated
variable gain cell, and an operational amplifier.

The SA571 is well suited for use in cellular radio and radio
communications systems, modems, telephone, and satellite
broadcast/receive audio systems.


• Complete compressor and expandor in one IChip

• Temperature compensated

• Greater than 110dB dynamic range

• Operates down to 6VDC

• System levels adjustable with external components

• Distortion may be trimmed out

• Dynamic noise reduction systems

• Voltage-controlled amplifier


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   Datasheet for the SA571 Compandor
Used in
Analog Delay 585
   Analog effects pedal built around the BBD circuits.
ISR Vocoder
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