Let's make a Voltage Controlled Oscillator (VCO)

Let's make a Voltage Controlled Oscillator (VCO)

In this video we create a voltage controlled oscillator with a 555 timer chip, two capacitors, a 33k resistor, and a 10k potentiometer.

FAQ:
Me: Paul, 49 from USA
Education: United States Navy, University of California at San Diego B.S. E.E., University of Pittsburgh M.S. E.E.
Experience: United States Navy STS, Bayer Intnl Process Engineer, C.C.A.C AP of EE
Current: Retired
Health: BAD (Congestive Heart Failure)
Hobbies: Electronics, flying, amateur radio, music (classic rock)

[junksmith_wizard]

ABSOLUTELY AMAZING I HAVE SAT HERE ALL DAY WITH NO LUCK AND THEN.... A MAN WITH A PIECE OF PAPER SHOWED ME THE WAY. THANK YOU DUDE!

[TigerClawTV]

I think I have watched this video like 3 times now. Fascinating stuff. Would love to have seen this circuit hooked to a speaker.

[georgechambers]

I love 555 timers, have a whole bag and use them all the time. I really like the oscillator videos Hope your weekend was good!

[payamreisi]

Was the Schematic ok ?
Timing cap both leads to gnd?

[phenixr]

On the schematic you have the 33K resistor bridging 6 and 2, but in your actual circuit it bridges 6 and 3.

[jeremycole]

i enjoyed watchin even though his schematic had two problems. but still a thumbs up

[RoryFrenn]

3:11
1/-The integral goes from -infinity to t
2/- f(t) = f0+k * Vin(t) not f(t) = f0+k - Vin(t)
3/-The s variable in the Laplace domain is complex frequency and not time in seconds.
4/-Laplace is pronounced /ləˈplɑs/

[acestudioscouk-Ace-GACE]

Just what I needed to learn. Your style is such that I feel I'm sitting next to you and you are showing me one to one.

[roccorid]

Can we see some more VCO types? Thank you for your time.

[alfredtambunan]

You teach it very beautifully easy! My highest thanks to you!

[MichaelEckl]

I'd love to get into the math for this!

[mikeoliver]

Nice I'm going to have to dig out a 555 and play with this today.

[agustinferrari]

Minute 6:51 - your capacitor is with both terminals to ground. You should change that schematic.

[mortenrobinson]

3:57 not obviously. It seems that many IC manufacturers can't quite agree where to put the vcc pin. I have another device here on my breadboard where vcc is on pin 1 and gnd is on pin 6.

[cwebs]

I believe your drawing is wrong on pin 2. You have both legs of the cap going to ground

[SimpleEnoughk]

Thanks Paul for the intro on 555 based VCO. I think there's a mistake in your schematic at 06:43 as both ends of the timing capacitor are connected to ground. Obviously you didn't reproduce the error on the breadboard otherwise it wouldn't have worked too well. Keep up with the good work !

[jamest.]

Great video. I discovered the 555 when I had the crazy idea if building a DC motor controller! For a big DC motor. Like for electric vehicles! I guess they need to be a bit more complex . than just a 555 and a ton of MOSFETs! I heard they will work. Just not likely for long. They need safty shut offs and current sensing. To keep from frying something! Keep up the good work,

[jasssam]

What is the extra wire connected to pin 3?

[matthewflynn]

What is the best way to hook this circuit up to a speaker?

[khaledhosny]

Great, what is the value of the variable resistor and the capacitor voltage?