Comparator tutorial & clapper circuit

[powermaks]

did anyone notice the nuclear detonator 3:00?

[freitasnetuno]

man you're great, just got my subscription! Thanks!

[Hellcommander245]

I'm thinking about using this circuit in a clap activated outlet plug, so all I have to do is clap and anything plugged into of turns on or off

[guerrillaman69]

it's a fap detector

[jdflyback]

Man op amps are awesome.

[magixeleven]

the cuban black market? :D

[CoolDudeClem]

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

[letsgetverydrunk]

the possibilities are ENDLESS!!!

[FailsAreEpicToo]

I like the idea you showed for a different load at 2:58

[crafter2u]

can you make a circuit board for testing LM324N ?

[tempest411]

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...

[1234jacee]

I always get my shit from the Cuban black market! How did you know?!?!

[KapriJohn]

I like your videos! And I like the gags hidden in those videos, they keep me smiling while I'm learning. E.g I didn't know nuclear detonators have to be powered with 24V, so now I know why mine doesen't work...

[NTG56]

@Afrotechmods If you used 8 comparators with different resistors (to change the volume threshold), could you make an 8 bit analog to digital circuit?

[EddieTheTurtle]

Please help! I built this circuit with LM324N and its amplifying only bottom half of the signal and 1/10 of top half. Its being powered by +5v supply from 7805. I'm trying to fix this since yesterday and i think i will commit suicide if this thing won't work! Please someone save my life!!

[URKIDN1]

this is a awesome tut. :D

[URKIDN1]

lol nuclear detornator

[TheTubejunky]

@Afrotechmods Would this work just as fine with an LM339 (made by Texas Instruments) making use of the multiple comparators embedded in this chip?

(one used as a Op amp another used as a comparator)

Or would I require an LM324 for an opamp and use the LM339 just as the comparator?

[AntiHerbert]

clap sensitive LOL

[agentjwa]

2 people wired theirs to nuclear detonators

[joshstube]

Thanks!

Can I adjust this circuit low enough to be sensitive to voice (think VOX control) or do I need more amplification/ components?

Thanks for the video!

[gaussman08]

thumbs up for black cubans XD !

[sinupinginaaber]

my LED just stays on. i have checked the circuit 6 times and made sure everything was exactly like in the schematic. I need a solution, please.

[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.

[sinupinginaaber]

@CassetteMaster i discovered my problem was actually the tripping voltage. i didn't pay attention to the resistor color scheme, so i used a 100ohm resistor instead of the 10k resistor, and i quess i had too much noise in my room, so the LED couldn't turn off. i changed the resistor and now it works. but thanks anyways.

[tonyisgrendel]

Sorry to flood your page. but an EE friend of mine suggested I use a -5V input on the op amp instead of the negative terminal of 1 supply and I was able to get expected comparator results in the millivolt region!!!!!!!!!

[tonyisgrendel]

Afroman, I was having a lot of trouble building this curcuit. My LED was always on!!! 1st I couldn't get much varaible output from my microphone. only about 0.03V all the time

Eventually I disassembled the microphone opamp and just looked at the comparator.

I had the 435mV output on the inverting input and I tested the noninverting input at diff voltages. and even though my - was low. The LED would stay on for any Voltage between 500mv - 1.7V and it wouldnt turn off until I hit 2V and above!!

[tonyisgrendel]

Afroman I actually meant that I switched the inputs put the mV input on the noninverting and put a variable input on the inverting input and

. The LED would stay on for any Voltage between 500mv - 1.7V and it wouldnt turn off until I hit 2V and above!!

I'm using a 741

[tonyisgrendel]

I did that because the LED would not turn off when I had the - input lower than the + when they were in the mV range. So I wanted to fine the limit

[Le0nLucky]

Thanks it helped me alot

[surfsk8smoke]

The Cuban black market stole it from me!

[PoutinePete]

This is very informative, but are you able to design a Hooker detector? Cuz that would be really useful.

[tomattosfutleimierda]

helUUuuuh

[kubrouk]

YOU ARE AWESOME! I LOVE YOUR VOICE! I LOVE YOUR STYLE! PLS CONTINUE! I'LL WATCH AND SUPPORT YOU IN EVERY WAY!

[coilsinamotor]

hooker detector!! omfg.... can u actually make thoes?

[mpampleki]

Electronics are fast and fun with you!.

[TheJagwtf]

hey, amazing videos, love the way they are made, could you please explain, i suck at reading diagrams i don't really understand where do all you ground go ?

I know what ground is earth - wow captain here

ground wire, or N wire - 0v

or its anything that's grounded

taking into account this circuit where do all the grounds go, please give some examples,

(taking that im using a retro-fitted Pc PSU will the 0v wire be my ground ?)

[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.)

[ivaneduardo747]

LOL the cuban black market.

[krizem]

Cool stuff any must have components for us experimenters or uber bulk packs that have everything (i mean this as a basic broad-sense) one would need for digital and analogue experimentation on breadboards or any must have kits?

[engelteir]

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

[noospaseisde]

Afrotechmods Imperial!

[AdeptAlbatross]

What about the hooker detector then - can you make one of those in a later tutorial?

[dmxspider]

^_^ awesome

[Albinorama]

Great excelent videos, please do more.

Electronics are fast and fun with you!.

[coilsinamotor]

qubin black markeket is where i got mine!! ;)

[trance183]

I love this guy! He's Awesome!

[SLY3001]

How bout a tutorial on the schmitt trigger?

[Z80Fan]

+1 for the cuban black market and the nuclear detonator! ;)

[bcsupport]

Thank you so much !

[Desmaad]

You're on a bit of a spree here, aren't you Afroman?