How to make a Voltage Controlled Oscillator

FWIW, when I got mine, it was in 1972 or '73.

Cheers! Rich

An official babe-magnet, field proven...that should fetch a bundle on eBay.

-- Cheers, James Arthur

"2001 - A Space Odessy" Came out in April '68 and the 8008 was introduced in April of '72, a full four years later. Sorry, we're not buying your "Daisy Daisy" on the 8008 "shortly after the release of "2001: A Space Odyssey."". ;-)

You have to remember that he was in a cloud of pot smoke, that whole time. :(

Maybe you can't, i still can. I could hear sine tones past 22,000 Hz as = a teen.

I've had to scrap several SVGA monitors because I could hear the horizontal sweep. :(

A Schmitt inverter, 1 cap, and 1 resistor.

Johny Radio, Noise Composer

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Sadly, that's just an oscillator, rather than a voltage controlled oscillator.

The VCO in CD4046/MC14046 is about as simple as it gets. You get a few extra components in the package, but you can ignore them.

Voltage-to-frequency converters are even simpler, but tend to be more expensive these days.

Well, if you add another resistor, you'll get a VCO. It won't be linear, but hey... the guy said "simplest"!

I would, of course, take that one step further by reducing the schmitt trigger (which might be, say, 6 transistors for a CMOS) to a pair of transistors, or anything with negative resistance (tunnel diode, neon tube..).

Tim

-- Deep Friar: a very philos>> >