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Subject: Re: LM565 test circuit

Date: 08/14/02 at 9:58 AM
Posted by: Ron H
E-mail: rmaxh@yahoo.com
Message Posted:

In Reply to: LM565 test circuit posted by Kapil Gore on 08/13/02 at 8:00 PM:

You will never get zero degrees between the input and output at lock. The phase detector in the 565 locks at 90 degrees, plus or minus a few degrees, depending on how close you have the VCO tuned to your input frequency (see the graph on page 3 of the datasheet). The datasheet has enough applications and info to show you how to apply the part. You can get the datasheet at

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