Why Converting AC to DC Results in Higher Voltage Output

[@mjdorads]

Correct me if I am wrong. The voltage increase will also be proportional to the AC cycle. So for instance, a bike dynamo generator will have a low gain due to low cycle being generated.

[@DaleLiles]

Awesome example! I've been searching for the answer to this question for a while and it' was surprisingly harder to find then you'd think.

[@kee22mah]

Great video as always. As others have said that is a Bridge rectifier. If you feed it 120 volts AC RMS (root mean square), the peak to peak AC voltage is around 170 V. You can expect around 170 DC. With no other components, smoothing capacitors etc, it will be, as you says, rough but it will operate the motor. Be cautious, 170 volts DC would hurt!

[@iEnergySupply]

Nice! Got the answer to my question withing the first few seconds of the video! Ty

[@tagalikha788]

Very nice content. I'm old but i'm learning. Thank you.😊

[@joemccann6093]

Do you have any videos on audio/ audio engineering? Microphones, mixers, etc?

[@iEnergySupply]

I don't

[@TerryRGraham]

Why do I see 310 volts DC on a GBJ1506 bridge rectifier with 120 volts input?

[@ChrisCamaro]

At the end of your video your illustration suggests that the rectified DC voltage will "favour" the peak voltage, settling in on 172, with no loss of that peak voltage, apparently because the capacitor has a more responsive and steep charge slope than a discharge slope. However if a capacitor is like a water tank, it will fill as quickly as it will empty if the pipes don't change size. Why then doesn't the capacitor cause the voltage to settle on an average or RMS value? If you put a cap on normal AC it would zero it out so why does it settle on the peak value when rectified instead of averaging it as one would expect?

[@mrsemifixit]

How does a full wave rectifier flip the negatives into positives?

[@jesterraj]

so whats the real voltage the dmm voltage if usin a rms meter or the velleman?

[@dronai]

If you ran a led using a diode not a full bridge rectifier, would you see the light strobe at 60 HZ ? Also what is the "allowable" % of ripple in a sensitive application ?

[@electronicsNmore]

I have done it many times. The flickering is BARELY noticeable. Only detectable when you are not looking directly at the LED, but with your peripheral vision. At frequencies lower than 40 it becomes more noticeable. You can place an electrolytic capacitor parallel with the LED to help eliminate any flicker. A very small ripple is fine for just about all your powering needs. Larger capacitor = less ripple, but you will not get rid of all the ripple. Be sure to watch my other videos, especially the transformerless power supply videos.

[@JustForFunRC]

Nice! Thank you. Now i understand it a bit better.

[@haz939]

Thanks for the new video!! would have been safer to use a transformer between the AC line and the oscilloscope? will have to try this myself, I've never use my oscilloscope to look at AC sinusoidal waveforms before. Will try some diodes too would like to know what standard and super fast diodes do to the waveform.

[@electronicsNmore]

I thought of using a low voltage transformer, but I wanted people to see that actual 125vac to 170vdc transformation. Makes it clearer. Look for some high voltage faster switching diodes like a 1n4935 - 1n4937. Give that a try on the scope. See if there is any difference in the waveform.

[@michaelcostello6991]

Great video. Really interesting and explained so well. Thank you

[@electronicsNmore]

Be sure to rate thumbs up. :-)

[@W45Jasper]

How do you determine what capacitor to use?

[@electronicsNmore]

Depends on how much of a load you plan on using at the output, and how much ripple you can tolerate. They have online calculators. Thanks for watching!

[@kevinhirt]

hey, i was wondering how i can power my custom automotive sound system indoors, it runs on 12-14 volts dc and will draw roughly 1100 watts max. I currently have it running on an old 300 watt computer power supply, obviously it goes into over current protection mode whenever I turn the volume up.and i dont want to spend $400 on a new psu.

[@kevinhirt]

maybe a modified MOT? with a few big diodes.

[@ChrisCamaro]

Put it a different way. If I start with 170VDC and put a cap on it, I still get 170VDC. If I start with 170 VAC rectified, as you have it, put a cap on it, I still get 170 VDC. However the original waveforms have different areas under the curve and thus different energy. How can both waveforms end up producing the same DC voltage when they started with different areas and different energies?

[@electronicsNmore]

The diodes made the conversion. If a heavy load is applied to the rectified AC(170VDC) and the capacitor value isn't large enough, the output voltage will drop and a ripple will be seen.

[@jesterraj]

hi does the scope scree look wash out in person?

[@electronicsNmore]

No

[@jesterraj]

so its bright blue?

[@surgingcircuits6955]

Oh, crap. You just cost me money. I love that handheld scope! Ordered one. BTW, loved the video, too.

[@surgingcircuits6955]

I am wondering how you set the 20v/DIV max scope to 100v/DIV. ???

[@proudbugowner]

you set the probe setting to 10x from within the scope too so 10V/div becomes 100

[@jesterraj]

hi good vid ,can I do this using a siglent scope Siglent SDS1102CML?

[@electronicsNmore]

You should be able to do this using all scopes. Thanks for watching!

[@88merc300e]

Very good video thanks.

[@electronicsNmore]

Your welcome. Thanks for watching!

[@michaelcostello6991]

nice video but you could have discussed circuit and the current flow through the diodes. Also it would have been vice to see the circuit as you changed it each time. Otherwise we only see half the picture. Thanks Mike

[@elephystry]

You didn't really explain where the 120 volt value comes from.

[@electronicsNmore]

conduit122 That wasn't the purpose of the video. The purpose of the video was to explain how AC is converted to DC. To answer your question, the 120v reading is an average. Thanks for watching!

[@elephystry]

120 volts is an average of what?

[@electronicsNmore]

conduit122 Average reading for AC voltage.True RMS

[@elephystry]

Oh thanks c:

[@billybonewhacker]

Awesome vid bro.

[@electronicsNmore]

Thanks!

[@jesterraj]

i mean with the voltage u did. .

[@electronicsNmore]

Yes