Comparator tutorial & clapper circuit

A tutorial on op-amp comparators, and a demo circuit that lights up an LED when the sound volume reaches a preset threshold.

[mkepler]

thanks again Afro Man, I used this comparator circuit to make my own solar charge controller, and a boost converter to set a reference voltage, with a 555 to time a relay to allow the comparator to sense the battery voltage. its very simple and I can fix it if anything goes wrong. I personally want to thank you and so many others that have contributed to my knowledge base, when I need to design something, I just go back and refamiliarize myself on what I was taught by all of you, thanks mike

[mistythelion]

I drove myself mad trying to figure out how comparators work. This made it super easy to understand thank you!!!!

[mkepler]

just wanted to let you know I use this circuit quite frequently, and use this video as a reference, thanks AFTROMAN, I wish you would start making videos again. you are and will always be the best in my book!!! mike

[tempest]

Holy cow...I just tried this circuit and it worked! I'm thinking of using this circuit with two thermistors on the two inputs as part of an automatic temperature compensating thermistor-based low fuel warning system on a motorcycle. The factory ones are thermistor based, but very crude. They only use one thermistor and are subject to temperature extremes that render them inoperable...

[CoolDudeClem]

You could also swap the v+ and v-, giving you a comparatator that turns off when the voltage reaches the threshold.

[MochaMameX]

spent a large part of yesterday searching for a clear example of the output voltage because everywhere I read it sounded like one of the comparators would become the output and it didn't make sense... this video was perfect for me, thank you!

[Fardado]

Dude, this is hilarious and very helpful at the same time, thanks.

[topten]

Your voice and all explain is really great

[MephistoRolling]

This one was especially helpful to me, it gave me new insight into some of the circuits i am designing right now.

[philipclegg]

I dont mean a hooker detector... Brilliant!

[brentacus]

Awesomely put, I finally understand how op amps work❤

[scottbaileyExplores]

Many thanks. I was having trouble understanding opamps and as soon as I saw this i fully understood it's purpose. Especially as i am using one with a transistor to control a USB VCC to power rail when 12v VIN is not present. Thanks!

[ubuntututorials]

@TheJagwtf Think of the ground as just a point where all the "grounds" are connected. Usually the ground is connected to the battery (-) terminal, but *not* always, so don't rely on it unless it isn't specified. Wherever you see a ground symbol, mentally draw a line to the nearest ground. It's convenient because otherwise schematics would just get cluttered with links between all the grounds. It's a similar story for voltage symbols (like 3.3V, 5V etc.)

[DiveSafariNZ]

These are good videos, so clear to understand.

[andrewferg]

Thanks for the informative video! Was able to apply this in comparator circuit for a thermistor controlled fan in my DIY power supply. Much more sensitive than using a single BJT and easier to adjust. Great voice, by the way.

[s.sradon]

I can use this in combination with a MOSFET/relay and a voltage divider to create a low/high voltage cutoff. very useful

[Thompzy]

Could you put a flip flop on the output of the op amp to have it to where you clap to toggle the led?

[aelucif]

1:51 why is there a resistor before the ground? i think this is too advanced for me, what source would you recommend for learning how to make circuits, specially for audio? this channel is great, but it goes over my head

[HippioKass]

3:07 *claps hands* *triggers nuclear detonation* opps

[CassetteMaster]

@sinupinginaaber Try turning down the power supply to 4 volts or so. I built the peak detector version and at 5 volts it stayed on. At 4 volts it worked right.