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Old 14th Mar 2017, 7:03 pm   #5
G6Tanuki
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Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,951
Default Re: Frequency counters

Considering how cheap these are, they're truly spectacularly accurate [to within a few tens of parts-per-million, worst-case!]

If you're worried about loading of the circuit you connect them to, a simple JFET source-follower

http://www.nutsvolts.com/uploads/wyg...rston_Fig6.jpg

will give you a seriously-high input impedance - good-enough that a few inches of insulated wire stuffed into the signal-frequency side of your existing oscillator will 'sniff' enough RF to give a good count.
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