Ramsey Electronics FZ-146 Specifications download pdf (Page 105)

FX-146 • 105

Unlike simpler PLL IC's, U6's phase detector has TWO outputs at pins 7 and

8. These outputs go through very simple low pass filters (R44-C68, R53-

C91) to cut back the 5 KHz whine sound of U6 at work. Op amp U5:A sums

together the phase detector outputs and the output of U5:A is passed

through a network of 2.2 uf electrolytic capacitors (C67,70,90,92) to smooth

out the phase detector pulses to clean DC for controlling the VCO.

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Ramsey Electronics FZ-146 Specifications Page 105