To learn electronics in a very different and effective way, and gain access to Mr Carlson's personal designs and inventions, visit the Mr Carlson's Lab Patreon page here: www.patreon.com/MrCarlsonsLab

Mr. Carlson, you know as much as I do at this point... Me : LMAO I wish !! that's why I watch every video you make, BEST TEACHER EVER!!!

Every time he says, "You know as much as I do," I laugh. No, no I do not, sir.

This man has the best - voice set performance / vocal, mic audio in my opinion on entire KZfaq; video voice is so clean and crisp w/ hint of old radio sound mic (without any his or interface) I just love it + love every now video he pushes out 😎 for me yet again 1h of quality - educational program; well spent 👍

That Fluke tricked me haha. It looked like it had somehow been sawn in half and still working when you were probing the supply rails on those ICs. Remote display. Very cool feature after looking up that model. Nice repair, too. Wonderful content in some tough times lately. Thank you so much, Paul. It helps me and many others keep trucking.

This is just pure art, from the root cause analysis, to the electrical design, to the physical layout of the circuit board, to the individual solder joints. Fantastic, these types of videos are what keeps me coming back!

I can tell you one thing, I got no idea of what you are talking about, but I enjoy your videos.

Others: The regulator IC is fried, gotta get a new supply. MrCarlsonsLab: I'm going to design my own new board with the same footprint. Totally admire you sir!

MR CARLSON THAT IS A LOVELY PIECE, BEAUTFULL LAID OUT AND LOOKS GREAT QUALITY I JUST WANT TO SAY THAT YOUR CLASSES TO ME ARE PRICELESS AS IM 50 AND STILL LOVE TO LEARN AND ALWAYS DO THANK YOU FOR SHARING YOUR KNOLEGE TO US ALL YOU ARE AMAZING

This is one of the best instructional videos I've ever seen on KZfaq. You are very gifted Mr. Carlson. That is why I have been a Patreon subscriber for over a year now. I do wish that I was younger again & Went into electronics repair when I was going to signup to Devry Institute back in 1972. But I didn't have an instructor close by with knowledge like yours to Elmer me along. I chickened out at the last month of application. So I turned to a 50 year career in motorcycle mechanics instead. At 70 now, I've got the time to listen & learn from you, But I just can't turn back time. I just wonder where Electronics would have taken me in this wonder world of digital technology ? I started as a Novice Ham building Heathkits with tubes which I still have But don't turn on anymore because I can't get parts & Couldn't get them working again with my limited knowledge. THANK YOU for sharing your gifts of knowledge with us ! I do hope you read this.

Paul, you're a very smart guy and thankfully you live within our time. I am constantly surprised at the things you do with circuitry design, and I can't thank you enough for the tips and pointers you've taught us over time. If I could continue to be a supporter on Patreon I would do it in a heartbeat, but Covid-19 has affected my health and wallet these days, I reluctantly had to back away from support. As soon as my financial situation is restored, you best believe I will return to Patreon and supporting you once again.

The Bob Ross of Electronics! Best! Job

When I was a kid, I always enjoyed watching Don Herbert on Mr. Wizard's Lab. You transport me back in time with your clear explanations and graphic demonstrations of how things work.

Your videos are so therapeutic, and always remind me of Christmas, sitting in a dark, warm kitchen in the middle of the night on a chilly winters night, having just discovered one of the best engineers in existence. Thank you ever so much, dear Paul, I come back again and again to your channel, a real Rolls Royce of engineering sources. I hope you have no more cracking trees and iced wires this winter :) God bless you all. Shalom. Blessings. Matthew.

You're so calm while you're working on equipment. I evaluate repairs on a "curse scale" From a 1 curser to a 10 curser. 😁

Absolutely right on sound quality. Same mike as The Blues Brothers used.

Oh boy, does this bring back memories. I think this is the Anatek 25-2 lab power supply. I used to sell these to schools and labs across Canada. Anatek was started by Allan Crawford who also started Allan Crawford Associates. I was a sales manager at ACA. Anatek was more importantly a designer of custom OEM power supplies. Our largest order was for a custom designed switching regulator multioutput power supply for NCR cheque sorting machines that were produced at a new plant in Waterloo Ontario. Volume was so high that the power supplies were shipped daily in custom made shipping containers that fit directly into the cargo hold of 747 cargo jets. Anatek was the 2nd largest customer next to the Canadian Post Office, Vancouver to Toronto! If anyone can relate to these facts, I will expand on the story of how this large order was won! Brad Watson

Im going to watch this to save myself from creative depression. Mr. Carlson is almost like a superhero, especially in soviet cartoons. Thanx for the video!

Thanks for that video! Even though I was tired as hell I still sat here and watched all of it becaue you've put so much effort into making those videos, and they are clearly very informative and enjoyable. Especially because your videos are models for what can be done to help the planet: Reuse equipment by repairing it, not buying something new. I wish there were more people like you.

Your welding looked incredible . Just wow ;-)

Thank you. Nice repair and power supply.

Stumbling upon this channel years ago and subscribing has been better than four years of electronics basics classes in college

My brain thought that fluke display was edited in.

The best audio on KZfaq 😃

Very nicely laid out 👍

Whenever I see a panel meter that says "Amperes" I know I'm in for a good time.

We were so poor when we were kids that we couldn't afford batteries for our "Operation" game. Then one day my cousin figured out a way to just plug it it into the wall outlet. It was sure an exciting game after that!

I’m only 6 mins in and I know I’m giving it a thumbs up 👍

"The reason they socket those things is for a reason". Wise words, there. Should be a T-Shirt ;-/

That’s a beautiful example of a star ground, Paul! It occurs to me that many of your viewers might not understand the concept and why it’s essential in devices like these. Perhaps you could explain it in a future video?

Bob Ross of electrical engineering...excellent lesson.

Ever nice to watch a pro

I'm really blown away by you designing a new control board for that old power supply. Laying out the double-sided circuit board really looked awesome. Giving old equipment new life is very satisfying.

Nice design Mr. Carlson. I built my +/- 15v supply using 2 LM723s around 1980. Still going strong. Rock solid regulation, no noise. Love those chips!

I have these visions of Mr. Carlson's Lab and My Mechanics joining forces in the future..."This electronic part is bad and unobtanium"..."I make a new one." Love the channel Paul please keep them coming!

I am a newbie and have taken up electronics as a hobby. I feel empowered by repairing old radios (replacing capacitors, fixing broken traces, hunting down shorts, etc). I was amazed at what you had come up with in order to keep your old power supply running. And I agree, that PS is a beauty! I love old analog equipment like that and would have been crushed if I owned it and found that replacement parts were no longer available. Your knowledge, expertise, and talent to design the replacement board on this unit has encouraged me to become a patreon member. This video has sealed the deal for me. There is literally nothing that you cannot fix! Great work!!

Amazing. You are such an asset for the aspiring to understand electronics and the associated science and tech of what You do. Thanks Mr. Carlson.

As always you are so meticulous and thorough, it makes me wonder if you are human at all. Beautiful work!

When you learn more in an hour then a whole week at school.

When I clicked on this video I, by no means, expected more than a quick repair/restoration - I didn't expect a complete control circuit rebuild! Beautiful and elegant work as always Mr. Carlson. Thank you for sharing these insights with us; it's always much appreciated :) Edit: the additional near hour (!) you spend explaining all of this in even greater detail (including all about the reference noise and how you did your board layout) on your Patreon is absolutely priceless! Thanks heaps for that especially. :)

very cool design, and it was nice of you to pretend that you didn't know it was the IC's the whole time LOL. For future video ideas, i for one would love to see videos on using gear to calibrate other gear, and the nuances involved in measuring RF as opposed to measuring AC. thanks for all the great content!

Glad to be back in the lab! Amazing videos.

When Mr. Carlson showed that new board I was amazed. It looks really nice. What a skill to be able to do that.

Is it just me, or is the TO-3 the most beautiful transistor package ever?

First time watching a Mr Carlson's Lab video. WOW!! I'm blown away!! What a great teacher, excellent presentation, excellent soldering skills, excellent diagnostic skills. WAY, WAY beyond my ability. This has to be one of the best channels on YT. Instant subscriber, even if I do end watching the video feeling like I'm as smart as a length of 2" x 4" LOL!!😂

I love your videos when you make a replacement board. It's an excellent way to give a new lease of life to an old faithful piece of equipment. I've seen you do the same before with other equipment. Certainly takes some genius in electronics! 👍🏻

Funny I was just working on one of these I built in school, in 2001, in Electronics devices & circuits 16 week semester one of nine to get my electronic certificate. *Not as fancy or dual like yours,but a useful bench supply.correction its a bad c3230,and it tested good, on the diode setting ,lighted up when I clicked the switch. But on board, a little black near it, the To-220 package c3230 npn had megohm readings on ohm setting between base & collector instead of 460 meg ohm's aprox, on the new one. I ordered two new c3230. Its adjustable, 0-15 vdc. [ Now I can watch you work & repair.]

One of the best hours I've watched , well presented video. Billy from Scotland 😀😀😀

Your circuit boards are so fantastic to look at!

Watching somebody solder a resistor to a VR just laying on the bench. The hands of a surgeon. Without tying it down, I would have chased it around my bench, through the kitchen and down Main Street.

Great to see someone who is an expert in analog circuit debugging and methodical in their approach in fixing things without taking short cuts. I just finished repairing a Pyramid PS-26KX supply which had destroyed itself when I test shorted its output. How dumb was that! I thought it would protect itself, but unfortunately the event must have been fast enough (or inadequately designed) that the SCR blew itself, one of the four 2N3772 transistors shorted base to collector and the UA723 regulator chip also blew itself up. The fuse of course was perfectly fine! I have replaced most of the damaged components some of which were obsolete like the SCR, but am waiting for a replacement 2N3772 transistor. Some of your techniques to isolate the problem and bypassing the regulator to test the pass transistor was very useful. In my case, I used another supply (with current limiting) to apply a voltage directly to the base of the pass transistors to control the drive voltage, open loop. Thanks for the tips.

Excellent fix 👍

I'll never understand why would anyone dislike this

Interesting technique there. I used to service Lambda power supplies for a CNC company in the late 70s. I forget the number of the regulator chip (could have been the LM723, I don't quite recall), but whatever it was, it was housed in a metal can. Nine times out of ten it was the pass transistor, one out of ten times it was the regulator chip. Got real good with a solder-sucker on those suckers. Never once tested them using the pot method employed here - that's a new one for me. Just goes to show you can teach an old dog new tricks!

Excellent repair and board build Mr. Carlson. Current limiting cutter-backer circuit works great.

Beautiful. I enjoyed

Woah! Never saw that remote display before on your Fluke DMM. I thought you were doing an illusion! 😆

I love watching your videos and am always impressed with your understanding of electronics. Thank you for making them.

I really like your careful and methodical approach to any of your bench work with an emphasis on safety. Something that was instilled in me as an apprentice back in the 70's here in the UK. In this project you sensibly check the discharge state of the filter capacitors, but your unit had no positve or negative pre use test state and you declared the caps discharged as none of the lamps lit and then went out. You may have just used the unit earlier and knew it functioned okay, but the safety mantra we were taught was " regularly check your test gear, so you don't check out" If you get a null reading check the test gear against a known source, especially when checking for high voltage. Keep safe and carry on with these great videos. I am an old engineer (retired) and now looking for a project to fill the time my wife doesn't fill (with her projects). I have been enjoying your restorations and learning whole lot extra to my experience in satellite communications (which involved very high voltages and RF radiation from HPA's and TWT's). I have long intended to restore a Bush VHF.54 radio that my late father-in law owned. It is about the same age as myself and I just hope it is not as stubborn and cantankerous.

That was absolutely beautiful! You, sir, are the Bob Ross of electronics!

OMG, first time Mr. Carlson re-uses a capacitor! Tnx for you video!

The question is, why did both ic's die a the same time? Essentially, there are two separate supplies in one box.

Used one just like that in the lab.....and those 14 pin IC's were usually going bad......great video.

I just pulled a 12 hour shift and I shoulda been in bed but I haven’t got to watch you in a while . So I watched the video ,, you are truly enjoyable to watch , and very good at explaining “why” . You’re awesome , love your work . Now I gotta sleep !! 73’s to you from middle Tennessee 🇺🇸 KK4ISW

Great video! And good to see that it also happens to other people that one project gets interrupted by another unexpected project. Happens to me, too! The MC1466L is still available on eBay for about 5 US-$ while the LM 723 is also already on its way out as you said yourself. I think I would have simply replaced the two MC1466 with new ones from eBay.

I like the 10x pot :) To each his own, they say. I have the 50 Volt 1 Amp version of this PSU and love it. It has a few flaws (right side current limit control is flaky, left side voltage control is scratchy at low end) but looks like the ICs are holding out.

That's a really nice work again. I also like building and troubleshooting electronic devices as a hobby. During my apprenticeship as an electronics technician for energy and building technology, we once built a controllable power supply in the vocational and technology center. It has a very simple structure with 3 transistors, a Zener diode, a few resistors, capacitors and a potentiometer. Although the circuit is very simple, it is very stable. Originally it was designed for a maximum of 1A at 6 to 12V output voltage. A few years ago I finally exchanged the series transistor for an "MJ802" including matching heat, installed a 12V 4A transformer and replaced the smoothing capacitor for a bigger one. I already had the transistor lying around. The power supply has worked flawlessly for years. Once the smoothing capacitor broke. I noticed this through an extremely fluctuating output voltage and the luckily short-circuit-proof transformer became very hot. After replacing the capacitor everything works fine again.

Wow, really cool redesign of the board. Great use of the space.

Have the single version of this power supply at work and it failed the exact same way. Thankfully I found a handful of replacement MC1466 in a parts drawer so pretty quick fix.

Since this supply went from working perfectly to suddenly not working on either channel, AND the culprit appeared to be failure of BOTH regulator IC's, but without the pass transistors failing as a cause for those ICs to fail......it seems pretty odd. I was hoping for some analysis into what might have gone on to cause simultaneous failure of two independent ICs that had been just fine earlier. This video appears to skirt around that issue entirely. I also wondered why there were not even any initial tests shown upstream of the regulator....no tests shown to check the voltage at the filter capacitors, anything like that; It was straight to suspecting the pass transistors, and then the regulator ICs. This may have been a good guess, or an educated guess, but.....it all seemed quite a lot like Mr. Carlson already knew what the problem was, and really wanted to do a video on redesigning the power supply......?

I appreciate seeing the visual impact of seeing 0402 surface parts on the same board as the huge capacitors. I have 2 of Lambda power supplies, with likely the exact same Motorola chip in them. One is is putting out 90 volts, and it's not supposed to. Anyway.... In the power supplies, they did something neat: they used a coaxial potentiometer (fine wire-wound rheostat/pot), that had both a coarse and fine adjustment on it. Their setup works well. After the fine control is set in the middle, and then sweep the coarse to get it close, and then get it just so with the fine adjustment. Good videos. Some of the best electronic videos out there are from ham/radio people.

I wish you’re the one of my very helpful neighbor! I will trade mowing your lawn to teach me electronics

Highest quality video and audio, a pleasure to watch! Thank you. What do you think could have caused both ICs fail at the same time? Power surge?

GREAT JOB! Nice redesign! I really enjoyed watching this. What I am curious about though is what would cause both identical chips to fail at the same time? Granted they are old chips but it seems very strange that both chips would fail on what amounts to two independent supplies???!!?? Unless you had a surge on your power lines perhaps?

As always, Mr. Carlson has produced nothing short of excellence.

The troubleshooting, design and construction is excellence at its best!

Wonderful video. I can understand your desire to replace the multi-turn pots but now an accidental bump of the control might send the voltage outside the safe range of the connected circuit. Whereas, with a multi-turn pot an accidental bump of the control might only change the voltage setting a little bit. Please don't take my comment as a criticism, it is just my thought as to why the original designers would have used the more expensive multi-turn pot.

Excellent design upgrade. I like how you even improved on the original.

Is there anything you cannot repair ? Very clever man

I can just imagine someone else in another 30 years taking that thing apart with an original schematic and being very confused.

The Gandalf of eletronics

My tech project in college was building a 5V regulated power supply using the 723 regulator. Back in the 80s most all of the equipment I worked on had linear supplies that used the 723. When I worked 2nd shift I used to mess with the day shift guys by fixing the problem they were having with a supply they had on the repair bench but not telling them. I love those Fluke meters with the removable face. We have a rolling mill at work and now and then the Can bus gets to acting up because of a bad connection. I can hook the Fluke to the Can bus, go around to the different devices with the meter face and watch the meter as I tap on each device to find the problem. Very Handy.

Love the looks on that power supply.

Mr Carlson you can get those IC's off ebay for less than $10.dollars

48:46 That zener diode is the most beautifully shaped and positioned component I have ever seen

You impressed me again. I was wondering how you were going to fix this one. Just create a new board, WOW!

Thank you for sharing your knowledge with us.

Most people: Faulty part no longer available. "Ah well!" Go out buy new power supply. Mr Carlson: Nah!

MrCarlson “I’m just going to redesign this board” 99% of viewers “Just?” 😮 Another great video. 👍 This and w2aew are the best two electronics channels on KZfaq, despite the fact every time I watch either, I realise how little I really know! 😂

Nowadays a MC1466L costs only $ 278.30 ! Good reason to redesign the circuit. As usually good job.

That power supply looks amazing... i just love the analog meters , real gold nugget.

Thanks for another masterful job-as usual. But I have no idea why the two ICs failed simultaneously.

I dabble with electronics and can identify the pieces. But when Mr Carlson turned the new board over and explained it, I felt like a hog staring at a wrist watch. Stayed lost for a good five minutes.

Ah, the good old 2N3055 - the EL34 of the silicon world, haha! A jellybean power transistor, p retty cheap and powertful, and damn ubiquitous. I've built a few power supplies, motor controllers and audio amps with these when I was learning electronics. It's a splendid idea to redesign and make a new PSU board, and the 723 is a real deal classic. It's been around for almost half a decade!

Yay 1 hour of Mc. Carlson's lab!! 😊👍

Interesting that both IC's would die at the same time in what is two separate supplies in one case. What could cause this?

"I turned the switch on and nothing happened." In the world of electronics, a thing will work until it doesn't. Sometimes suddenly. LoL

I love that fluke 233 with the remote head... definitely need one on my bench! :)

This is a really beautiful work! New and serviceable new circuit with a bit of the old one :)

Hi i wiunder if you have any explanation for the failure of two ICs at the same time?