January 6th 08, 02:32 PM
posted to rec.audio.pro,sci.electronics.equipment,rec.audio.tech,rec.radio.amateur.homebrew,sci.electronics.design
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external usenet poster
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First recorded activity by RadioBanter: Jun 2007
Posts: 67
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inexpensive analog audio pitch (frequency?) meter or schematic / plans for one?
"jack" wrote ...
National Semi still makes a "frequency to voltage" converter
chip, so does Analog.
But here's a link to using a PLL -- from National Semi --
Application Note 210
http://www.national.com/an/AN/AN-210.pdf
Note that publication is 29 years old and I don't think any
of the mentioned ICs are still in production any more.
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