EEVblog 1438 - The TOP 5 Jellybean Regulators & References

Dave looks at his TOP 5 (plus change) Jellybean Voltage Regulators and References, and explains why you need to know them.

00:00 - Jellybean Voltage Regulator & References
01:52 - 78xx Linear Voltage Regulator
08:01 - Adjustable Voltage Regulator
13:52 - 1117 Low Dropout Regulator
15:21 - LDO Stability
20:01 - LM4040/4041 Voltage Reference
24:38 - Using a Reference as a Regulator
30:53 - TL431 Voltage Reference
38:58 - Use as a PSU regulator
40:43 - Beware of Stability
41:43 - REF01 a better Voltage Reference

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#ElectronicsCreators #Jellybean

[mikeselectricstuff]

I'd add LP295x for low-power applications

[pyrokinetikrlz]

"It is just a zener diode, a resistor, an emitter-follower, some business (the other 20 transistors in very advanced configurations), and bob is your uncle! no worries" - Dave

[jimreineri]

After spending the last three decades in the ethereal software world, in my retirement I have sensibly returned to the tangible world of electronics hardware. This series is exactly what I need. A perfect refresher. Also, it is comforting to see that most of these parts are the same as what I used a lifetime ago!

[danej]

Dave, these JellyBean vids are GREAT, some of your JellyBeans were not common when I was new and studying to be an EE in the 70's they were more common when I went on to graduate study!!! Thanks

[AnalogueGround]

78 and 79 regulators have made power supply design so easy that they've overshadowed newer LDO and generally higher spec devices. Being around for so long and making life easy makes them worthy of nomination for the award for device of the century!

[algorithminc.]

Takes me back - great series on these old 70's/80's chips. They made it easy to actually make something to sell - to start a company early (guitar effects/synthesizers). Many thanks - great channel. Cheers from Florida, USA

[Willy_Tepes]

This series is great Dave. Jellybeans are exactly what I find when desoldering old boards.
Us poor electronic nerds thank you. No component shortage is gonna stop me. Next, jellybean microcontrollers?

[dreamcat]

in terms of not needing to put smoothing caps on the output of some of these regulators... Steve (SDG Electronics) did a recent video exploring this. With some test boards and different regulators etc. adding excessive capacitance where they are not needed is not always "harmless"... it can actually made the performance worse in some cases. Recommended to watch his video (SDG #212)

[nameredacted]

KEEP ON ROLLING with more videos like this!!! Top transistors, top logic families, etc!!! Please!!!
Such info is critical for inexperienced engineers! This is MUCH more important than teardown videos! Anyone can do a teardown video (less experienced comments on design), but very few on YT can present such knowledge as you do! So spend less of your resources on teardowns please, and more on engineering tutorials!

[artrock]

These "jellybean" lists are great! I hope to see a decent list of these in your video library. Thank you for posting! 🙏

[vasiliynkudryavtsev]

The jellybean series was quite useful, because new designers and hobbyists do not know much about established standard components.
Please, continue this series to cover other fields. E.g. transistors, mosfets, interface chips, ADC/DAC.

[mikeselectricstuff]

I've seen 78xx regs oscillate with no output cap

[CarlVanWormerAEGD]

Stability is important! Remember . . . in the extreme case, lack of stability can apply the full input voltage to the output terminal. 12V input regulated (with stability) to 3.3V logic power can potentially blow up your logic chips in an unstable (or slipped scope probe) condition. Usually the highest tech (smallest device geometry, probably memory or MCU) part will act as a crowbar device to protect the rest of the parts on the board.

[matthewbeasley]

One other 1970 era part I'm glad you mentioned is the TL431. It was designed as a voltage reference, but today finds heavy use as the feedback element in switching power supplies. It's made by the billions and most EE's haven't heard of it if they don't work on power supplies.
The relevance of this video is it is a good complement to a LM317 / LM337 to get a far more accurate output voltage. You can get sub ±1% accuracy by pairing the two parts.

[kanadmainkar]

This series is very helpful! Please keep 'em coming!

[Directory]

Yes more plz. Makes my life and job easier.

[BobDiaz]

I had my electronics students built a half wave power supply with too small a filter capacitor. Then we added a 7405 voltage regulator. They could see about a 1 Volt peak to peak ripple on the input, but couldn't measure the output ripple because the noise was greater than the ripple. It was an impressive lab for my students. I love the 78xx regulators.

[gordonwelcher]

I would like to see a video on extreme components with unusual specs.
I could do this myself but it is more entertaining to see Dave do it.

[nameredacted]

NEVER depend on internal overtemperature shutdown (ALWAYS mount on sufficient heatsink to avoid the problem in the first hand)! Some of these kick in at 175°C TJ, etc. Ouch!!! And some datasheets clearly state "if you repeatedly activate the internal overtemp shutdown, you are degrading the chip"! And what will chip performance be right before shutdown???

[matthewbeasley]

The longevity of these linear regulators is fantastic. Many parts come and go, yet these are still here. I design power electronics systems for a large multi-national, and one of our requirements is ± 24V for current sensors. The flux gate and closed loop hall current sensors up to about 300A can do ± 15V supply, but the big stuff into the high hundreds and thousands of amps requires ±24V. What makes it extra complicated is the hall and flux gate current sensors have a tight specification for the power supply rails. Today we use paired 7824 and 7924 regulators to post regulate the switcher supply and get our low ripple, high accuracy ±24V rails.
Sadly, the 7924 has gone sole source and it's making the supply chain people nervous.
We've considered using the LM317 & LM337 paired. I have an inclination that the LM337 will be longer lived, but... it is merely a hunch. In some ways I have the gut feeling that the LM337 may be the B52 of chips, and make it to the 100 year mark.
Sadly, based on the fact that it is merely a hunch, we're going to high speed monolithic switching regulators. We'll see in a decade if it was the right call.