Image:Hobby frequency counter.jpg
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[edit] Summary
This is a hobbyist-built main circuit in a 6.5 digit frequency counter, constructed almost entirely from 74xx series integrated circuits on a wirewrap board. Built in 1985 and still working over 20 years later. Working from the bottom row, a crystal oscillator signal is divided down to 1Hz squarewave and gates the frequency to be measured into a set of decade counters (2nd and 3rd rows up) and the top two rows a set of latches feed out to a BCD decoder and display driver (off this photo). Logic resets the counters prior to loading more incoming pulses.
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- (del) (cur) 20:52, 15 February 2006 . . Colin99 (Talk | contribs) . . 1955×1425 (358,971 bytes) (This is a hobbyist-built main circuit in a 6.5 digit frequency counter, constructed almost entirely from 74xx series integrated circuits on a wirewrap board. Built in 1986 and still working 20 years later. Working from the bottom row, a crystal oscillat)
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