This part is a kind of semiconductor called NE567.

Function of this product has Tone decoder/phase-locked loop.

Manufacturers : Philipss

Image and pinout :

Some of the text within the PDF file :

Philips Semiconductors Linear Products Product specification Tone decoder/phase-locked loop NE/SE567 DESCRIPTION The NE/SE567 tone and frequency decoder is a highly stable phase-locked loop with synchronous AM lock detection and power output circuitry. Its primary function is to drive a load whenever a sustained frequency within its detection band is present at the self-biased input. The bandwidth center frequency and output delay are independently determined by means of four external components. PIN CONFIGURATIONS FE, D, N Packages OUTPUT FILTER CAPACITOR C3 LOW-PASS FILTER CAPACITOR C2 INPUT SUPPLY VOLTAGE V+ 1 2 3 4 TOP VIEW 8 7 6 5 OUTPUT GROUND TIMING ELEMENTS R1 AND C1 TIMING ELEMENT R1 FEATURES • Wide frequency range (.01Hz to 500kHz) • High stability of center frequency [ ... ]

NE567 PDF Datasheet Download