Datasheet for the CD4066B quad bilateral analog switch from the CMOS 4000 series. It describes the four independently controlled switches, on-resistance versus supply voltage, signal range, leakage and switching times, plus the pinout. Repair technicians meet it in audio signal routing, multiplexing and older control circuits. Use the document to check control pin logic and expected switch resistance while troubleshooting, and note that on-resistance rises at lower supply voltages, which can affect circuits run near the minimum supply.
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