Zero beat is always needed to contact other station. AF8X wrote zero beat indicator. It uses LM567 op-amp to indicate the zero beat. The original article was described by WI5W in March 1992 QST magazine.
Another zero beat indicator is called "CW Zero Beat Detector" by Jerry Henshaw, KR5L.
K3WWP shows the zero beat circuit using LM567. It is from a letter sent by W6OWP, he mentioned.
Jackson Harber Press offers the kit of zero beat called "Son of Zerobeat". It has 7 LEDs which graphically inidicate the frequency of a received CW audio tone.
K6XX, Bob Wolbert wrote the visual CW tuning indicator on the Web. It uses XR-2211, FSK/Tone Decoder. LED illuminates as you get within about 25Hz of a signal. It will flash on and off a bit with the incoming signal.
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