EEVblog 1438 - The TOP 5 Jellybean Regulators & References 

I'd add LP295x for low-power applications

"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

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

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!

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!

5:52 I can imagine Dave answering a question on his exam at the day on how a 7805 works. "Well it's just a zener, a resistor and an emitter-follower doing some business and Bob's your uncle".

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?

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!

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)

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

Yes more plz. Makes my life and job easier.

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

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

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

Oops ... I learned that if I correct my English by editing after you give a "heart by EEVblog" that I lose it. Thank you for the great series and cheers to you ...

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.

Thank you for the series

YESSS DAVE!!! Awesome idea, top jellybean components! Absolutely loved the op-amp one, keep them coming! You're a real treasure sir! 🙂

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.

This series is so helpful to the beginner and hobbiest. BIG THUMBS UP from the Old Dart.

These videos gave me so much clout in my lab. i'm a software guy, but even having a passing knowledge of standard parts got me a lot of street cred with the hardware guys. EEVBlog is probably responsible for me ever getting a job at all lol

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.

Top 5 jellybean rectifiers next. (I can actually only think of 3 - 1N700x, 1N4148/1N914, and 1N5817. A discussion of the dizzying array of alternatives might help some of us understand why there are so many different devices designed to do only one thing in almost exactly the same way.) If you need LM79xx, be sure you have some electrolytic or tag tant capacitors handy, as these regulators require much more bypassy capacitance than their positive voltage counterparts for stable operation. On that note, I've noticed several designs using LM78XX and LM79xx that have the same capacitor values on both positive and negative rails, presumably for BOM consolidation.

I had used a TL431 and a power transistor to make a very simple variable electronic load that self-compensates for the temperature.

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???

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.

35 years ago at college as a project the whole class had to build fixed voltage bench PSU’s. +12, -12 and 5 volts out. First time I’d used a 7805. Used it to power all sorts of kit over the years.

TOP 5 jellybean switching converter? I think 34063 will be in the list but I want to know MORE!

I like these top 5 ones! Gives a good base for newbies to look in to with regards to some common parts.

I've seen a 7809 regulator ran at 38 volts input voltage in a commercial product, and it held up fine for 10+ years, but the 7909 on the negative rail died, but still works for around 10 minutes until it goes open

I enjoyed these videos of jellybean components-please continue this series!

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.

I love the series! Please continue it ;)

When you said TL431 I smiled from ear to ear, yes it's a great part. For some reason I've never used the 4040/4041.

Really loving this series! I'm hoping for a massive video on the end so we can have some kind of general purpose Jellybean Box that can cover 80+% of the things people want to build.

Wonderful. Very comprehensive, love it.

I picked up an old powered breadboard - one of those big brick jobs from Global - that's got 5-way banana jacks for ground, +5, +15, and -15, and opened it up to check if it was all 78xxes or if the bipolar were adjustable, and it turned out the answer was yes. Plain 7805 circuit on the 5v supply, and 7805 and a trimmer on the +15 and -15. Definitely a surprise.

I just love this, "Jellybean Component series", thanks! Dave

Jellyvean switching regulators/pwm generators please! Great series btw.

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.

Yes, more top 5 things: Top 5 useful beans, ..... As an young player I get drowned on all the specs when I try to select components. I really like how you highlight the most significant spec limits.

Great series! Love hearing what you have to say

The 431 is basically the entire reference and pass transistor control block of a linear regulator without the pass transistor. This is why the 431 is used so much in mains switching mode power supplies, as it can drive a linear optocoupler to close the feedback loop for the regulated output.

This is such a great series, Keep the videos coming ❤️

I learn my PPM's at 22:50 ! I love this jellybean series I hope for loads more....cheers !

Excellent series, keep em comming!

Great series! Keep them coming!

I finally feel like part of the community. "You have absolutely, guaranteed, heard of these." Success.

Love these Jellybean vids Dave, love to see more if possible, Thanks for all you do.

The opamp in the LM431 isn't acting like a comparator switching its output on and off. It is acting like a linear high-gain differential amplifier with feedback.

Useful thank you for the explanation and comparing those.

Brilliant. More of these great vids the better. I often only need small amounts of items at a time so jellybeaning is going to be a great way of bulking out an order to avoid extra P&P costs, almost free components if you want to look at it that way. 👍 Thanks.

You're a good man Dave! I'm sure EE shops are struggling for parts and it's even harder as a newbie trying to design my first pcb.

Great video, tons of practical information! Can’t really use a shunt voltage reference as a power regulator unless you’re prepared to run its current at the maximum current draw of your circuit. This means not low power. Love those TL431’s, even saw one with the opto isolator built in.

I love this series and hope to see more like this, I hope Dave makes a similar series for design. something like favorite/jellybean topologies to explain those most useful and recyclable circuit designs and blocks.

Please more Jellybeans! Very valuable information for old young players like myself!

Great video. It has rekindled my interest in building a 431 based crowbar circuit.

Excellent! I like these "Jelly Bean" lectures, Its Hobby Grade stuff. I can walk away with something here. Thanks

Hi Dave, love the channel. I built a variable voltage PSU, used it to charge a battery but it popped, magic smoke. Apparently, the work around is to insert a BY127 or similar between the output leg and positive output terminal of the PSU, being constructed.

Awesome Would appreciate transistors and power transistors next

The 78xx is also remarkably quiet. Check out Marco Reps video, as quiet as a battery!

Wow; I remember when the 78XX series when they first came out, they were amazing. Still around to this day...

Fantastic series Mr Jones keep em coming! come-a-gutsa Verb. (Australian colloquialism) To be thrown off a moving object at high speed, arms and legs flailing, landing on a hard surface and sustaining multiple wounds and broken bones.

Nice vid again thanks dave! Wow REF02. Saw that on a german site and used it for ADCs. Nice :)

Dave, these "top 5 jelly bean" component videos are very interesting and useful (& educational to us "young players," regardless of our ages). Also, the thumbs down function is still working at the moment (2123 EST, 18 Nov 2021), so _maybe_ the backlash had the desired effect?

Thanks a lot for this video series. It might be useful and very interesting to overview jellybean transistors. Maybe split in some categories like BJT, JFET etc.

Now the top 5 jellybean transistors 😊 Great video, thanks!

29:53 - Circle and line drawn over Shunt Regulator circuit - Now I know how Prince got his logo!

Using TL431 with LM317/337 together is great for low noise and stable linear power supply. Only critical point to achive that is to right matching capacitors in PSU design.

I'm enjoying it! Keep it up! Thanks

puolup is a very famous resistor manufacturer... I hear about puolup resistors ALL THE TIME.

Good vid Dave! Do more. Yes.

The LM340, was National Semiconductor's original number, for their competing part to Fairchild's uA78xx. But that was back in the 70s. Its all evolved into the generic 78xx. The stabilizing caps were needed on older parts. I had them oscillate, without caps, back in the early 80s. They DO change the part design, as the years progressed, without changing the number. Any 78xx built in the last 25 years, the caps are optional.

Jellybean series has been awesome, Dave! Since you brought it up, maybe "jellybean" comparators next?

My jellybean switching regulator, is the MC34063. Multiple manufacturers, and was (is ?) used in car USB chargers, in all those dollar store units.

Love this type of content!

Liking this series.

So informative!

Would love a TL431 in depth applications video!

Before switching supplies (70s) were popular, the 723 regulator was in most every linear regulated supply. I still see them in linear supplies today.

These are great, and if you run out of jellybean ones I'd like to see some videos with random deep dives into familiar or obscure component type hunts for the ultimate specs.

I have notice that a lot of people pick up LM317 with around output current up to 1.2-1.5 A. But what most people seems to have is LM317 from China with much lower max output current. I have a bunch at 0.1A. Took me as an young player a while to realise.

Great info. And Dave always makes me laugh. Funny bloke! Thanks!

Hi Dave, i really like the jelly bean series. so i say keep them coming! maybe you can also make a serie for different applications/uses/possibilities for these jelly bean components. that would be awesome!

And a trap for young players - 79xx has different pinout than 78xx as well as Vin instead of GND on the tab. Don't ask how I know that.

SOT-223, love soldering those packages.

Just ordered a bag full of 431s for the exact purpose described here. I have a lot of retro computers, from the Mac Classic and original PC to current gen. I always replace the capacitors in PSUs older than about 5-10 years, the threshold depending on how much I trust that brand's parts selection. Well, one time I didn't. It was a Delta ATX supply from the early early P4 days, with a heavy 5V rail and the 6-pin Aux connector for Athlon boards. I got three of those supplies, NOS, in one bid. I serviced two of them, and got lazy with the third. I ended up installing it in a box I use to image hard disks (it has a VIA Epia mini-ITX board and both PATA and SATA hot-swap bays.) One day it had just turned itself off, and I figured maybe we had a brown-out. Two months or so later, I tried to turn it back on and it wouldn't budge. The KVM it was plugged into was also acting kind of weird, so I pulled the case onto my bench. It was making a squealing noise, but some of my PSUs do that. I measured the +5VSB rail to see if it was working at all, and it was measuring FIFTEEN VOLTS. Yikes!! I figured that motherboard was toast, but it's actually alive and (I think) running fine. Can't believe that. Anyway, I pulled the cover on the PSU and the caps right next to the opto-isolation circuit were bulging from the top. Of course it's the caps. It's _always_ the caps. There was a 2222 transistor and a TL431 right next to it, so I figured I would go ahead and replace those too. I'm hoping to get some time today to replace parts and see if I can nurse it back to health. Shame to waste a good PSU on some dodgy caps... Always replace the caps! Even if they look OK, if it has a few miles on it, you're better off safe than sorry.

Reverse Protection Diode for 78xx, as at 15:20, can be eliminated in many cases by using 79xx instead, and regulating the 'ground' rail instead of the positive rail.

Quite a few years ago, I wanted to have very long battery life for my back-then-new Asus EEE mini laptop. I had an external 12v sealed lead-acid battery (as in a home alarm system) and I used a circuit that I made myself with a LM317 regulator, to make the 9.5V the laptop charge port asked for. It worked for a short time, then the output shut off. My problem was that I didn't know about the minimum 3v difference between input and output voltage at that time!

For the LM317, just use the voltage feedback divider to provide your minimum 3.5mA load current.

I'd also add MC34063 and LM2596 for switching mode DC/DC converters, but that's a bit more complicated :)

Another great jellybean video Dave. Thanks mate. How about transistors next?

This is awesome! Love your content.

I really hope this becomes a series

Another fantastic video. Maybe a video on jellybeans sets to buy for your lab would be something.

I HAVE had the output of 7805's go into osculations when the load cap is open. I don't know if it was brand of chip or what. The output measured around 4v, if I remember right. The scope showed a large amount of noise on the 5v rail. I replaced the cap and everything started working right.

I think the LM723 is useful when we need a completely customizable regulator and I have a huge (old) stock on them

Nice video clip, keep it up, thank you :)

To think at the time Atari 2600 came around 44 years ago, the 7805s they used would've been quite the marvel in low cost integrated technology

10 million jelly points goes to you.. Great video and presentation. You know we all have those cheap chinese V/A meters in our attics. Lately, I realized they display different measurements. Since you have covered voltage precision components in your video, wondering if you care to make another video about calibrating multimeters/AM meters DIY version. Cheers,.