2Mhz Frequency Counter Circuit

This is a schematic and block diagram of a 2-MHz frequency counter. It uses and LSI counter/display driver, LCD readout, and a few logic chips for timebase and timing pulse circuitry. Q2 and Q3 form a signal (input) amplifier. The circuit contains a crystal oscillator built around U3- c and XTAL1, which provides the primary timing-reference signal. That signal is then divided twice to provide two additional timing references, giving the circuitry three selectable timing references.
2Mhz Frequency Counter Circuit - schematic

The ICM7224IPL is an integrated circuit that consists of the counter and display driver to drive the LCD-004 display.

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