Great video !!! I liked the disassembly procedure and the internal overview. These power supplies would be ideal if in addition to sourcing current they could also sink current too, they would be even better if the current sensing and limiting would be done after the large ripple filtering capacitor ... comes in handy to test semiconductors when we don't want to apply all the capacitor stored charge. Best
In my opinion, a 'real' lab power supply MUST have a load on off switch as well as all the features you describe. But, finding one that has all the above is a challenge... Love your work!
I love your videos. thank you fo spending the time and effort in sharing your knowledge with the world. @ Ivanblogs that is the first thing that came to mind. Although he is right ripple and noise are much better with linear PSs. I have been (weakly) working on a design for a benchtop variable smps. It's performance will most likely not result in a fruitful use of my time but the time spent and magic smoke make it fun!
These are available on eBay. You have two choices. Somewhat cheap (not that cheap) $150-$180 and dubious condition, from a seller that is probably selectively choosing what "tested" means. Or fully tested and guaranteed, for $200-$300. I get nostalgia. But the dollars don't make sense. These aren't as bulletproof as nostalgia wants you to believe. Plenty of busted units for sale says they aren't all that great.
I need a good regulated lower voltage DC supply. My Lambda is incredibly nice for being all vacuum tube, but 500 volts @ 500 mA is made for tube stuff. I will hack 10 turn pots into items whenever I can find a way.. Single turn pots suck for fine adjustments. The Agilent has a fine adjustment. I have a neat old 1960 HP O Scope that still works great. I think it was stored outdoors in Arizona for a few years too. I'm shocked Agilent did not make a WWP 100-150 volt version. .
Dave, I know that you made sure to discharge those huge caps before working on the board, but you should have shown/mentioned it... keep the newbies from getting a wake up call...
Hi,would you please tell me way my power supply shows 3.89 constant current with out testing anything,just plug it in and switch it on. thanks in advance.
@cumesoftware There you go, that's one of the few reasons. Sure there are some, the point is that most general purpose electronics work will be under 15V for the majority of people. YMMV as always.
I agree. The ebay is flooded mostly with 120V models, and it is useless everywhere else. The lack of dedicated output on/off button, no external voltage sensing, no programibility via external interface (i.e. for programmed charging or measuring transient response of devices under test) and no way to easily change current limits on a fly without shorting output makes it meh in most modern labs. Unless you need few good adjustable power supplies cheaply locally (no shipping and can make sure they all work correctly), buy something else.
@SergiuszB Try rewinding the transformer instead of the "transistor" (which is a solid state device by the way), just get an auto-transformer and get it over with.
EEVblog I've a simple question, I connected a galaxy note 1 smartphone to the same power supply as yours and was able to make it working by powering up from the supply not the battery. Although the battery of the galaxy device says 3.7V the phone could not start with voltage output set less than 5V. Also, I can see that the current is fluctuating when I do different activities on the phone (e.g Bluetooth search and browsing), while my volt output is set to 6V. Now, if the current is 0.9 for example, can I say that my power consumption in watts is 6Vx0.9A = 5.4 watts ??
Dave, have you seen the new Power Supplies from Tektronix/Fluke?^We bought one for our lab and it's magnificent. You should talk to them and get one to review!
EEVblog All right, your risk (of going full-time video blogging) paid off and I hope you keep doing these videos for a long time to come Though considering your newfound experience in video-reporting and giving talks, I bet you're offered a whole different sort of job
Australia have a balanced system with no neutral. Using a grounding conductor as a grounded current carrying conductor is a no no in most countries. Floating ground inside the unit is cool. The earth in European service mains is likely to be so unbalanced I doubt it will work.
Hi! I have two E3615A and in one of these 2 the transformer sound is a bit louder than in other one, is that normal? I know that linear power supplies produce transformer buzzing sound...
Yes I'd say its normal, sometimes it can be caused by poor mounting of the transformer or something in the enclosure reverberating the hum. I had that problem on my Fluke 45 and it would drive me nuts, turned out that the unit got slightly bent in shipping and doing some re-bending fixed it.
Take the top off the unit and press on the transformer as its humming and see if it changes, its a mechanical issue. While you got the top off adjust the voltage display against an accurate reference, its quite an easy job and service manual is available on the net :)
Cute toy! I have a 50V/20A (need 48V for my humanoid robot) bench supply not that much bigger. I much prefer the coarse+fine 2-pot setup. It's a lot quicker to change the voltage/current than a 10-turn.
Is it just me, or is the audio a bit off sync? I noticed it in the beginnig when Dave's slapping the supply, as well in the solder paste dispenser video when he's lifting the magnetic holders.
Lets see back when I was in TV radio repair school in 1976 1977 we had HP power supply that used 220v AC 60hz and the out put went from 0 v to 1000 v ac or dc I was sitting beside a guy and he was playing around with it turned it up to 1000 and he tried to show off then it hit the Bench boom big arc and he got kicked out of the class Man those were the days.
how practical is it to add a load switch to this power supply? is it as simple as internally connecting a properly rated switch to either of the +/- output posts?
+Andy Cristea ye just a relay to the negative\positive binding post or a solid state relay if you dont want to hear the relay every time and your good to go
+the real illuminati thanks guys that was a good method. I actually ended up putting a switch inline on my red positive lead wire, so that acts as my "load switch", cheap and has worked pretty well for what I do
neppy5 putting a switch in series with the positive lead can create a forward voltage, depends on the switch you might lose even 100mV.. unless this psu has a sense wire I don't think it is the best solution. the reason for relay or even a mosfet is because relay typically are cheap and have a very low resistance compare to your on \ off switch. but, if it works for you that's great :D
Who knows, maybe they really didn't want that one to be converted so that they could sell the 240V one at a different time and/or at a different price. Could have just been lack of foresight too, but you just never can know for sure what the logic is behind some corporate decisions.
These guys are on sale right now (in the US) on Grainger for reasonably cheap: www.grainger.com/product/AGILENT-TECHNOLOGIES-Power-Supply-3PGC4?s_pp=false
there was a lady ( or a "sheila"? ) beating up on one of these p/s's trying to open it on y-tube and it was quite disconcerting to me then she busted off the cc button on the front the animal
"It is a bit wasteful in terms of energy consumption (for a given output power) but , ehhh, who cares about that?" - Umm, the sorts of people who measure the standby power of their oscilloscpes?
@cd4600 Having your own company and "being your own boss" can suck a lot more time than a 9-5 job, been there, done that. That means less time for fun stuff like these videos. If I can possibly make a living from making these videos, why not?
Наука
Great video !!! I liked the disassembly procedure and the internal overview. These power supplies would be ideal if in addition to sourcing current they could also sink current too, they would be even better if the current sensing and limiting would be done after the large ripple filtering capacitor ... comes in handy to test semiconductors when we don't want to apply all
the capacitor stored charge. Best
Great enthusiasm....keep it up!!
I love the way he points to the ad at the end.. Ahh. change... It all changes ...
In my opinion, a 'real' lab power supply MUST have a load on off switch as well as all the features you describe. But, finding one that has all the above is a challenge... Love your work!
Best of luck Dave with video blogging for a living. It's a tough gig, I hope that it pays enough for you to survive! J
We have about 10 of these in my lab at school. They are very reliable even with the freshmen connecting things backwards haha!
I love your videos. thank you fo spending the time and effort in sharing your knowledge with the world. @ Ivanblogs that is the first thing that came to mind. Although he is right ripple and noise are much better with linear PSs. I have been (weakly) working on a design for a benchtop variable smps. It's performance will most likely not result in a fruitful use of my time but the time spent and magic smoke make it fun!
I have the exact power supply. Been using it since several years no problem what so ever.
i had one of those when i was about 12 years old. 21 years ago. came right from HP.
The EEvblog is the best thing since sliced bread.
If Dave can't do it, it can't be done.
These are available on eBay. You have two choices. Somewhat cheap (not that cheap) $150-$180 and dubious condition, from a seller that is probably selectively choosing what "tested" means. Or fully tested and guaranteed, for $200-$300.
I get nostalgia. But the dollars don't make sense. These aren't as bulletproof as nostalgia wants you to believe. Plenty of busted units for sale says they aren't all that great.
These are the same power supplies we use in my Electrical Engineering classes. haha
I need a good regulated lower voltage DC supply. My Lambda is incredibly nice for being all vacuum tube, but 500 volts @ 500 mA is made for tube stuff. I will hack 10 turn pots into items whenever I can find a way.. Single turn pots suck for fine adjustments. The Agilent has a fine adjustment. I have a neat old 1960 HP O Scope that still works great. I think it was stored outdoors in Arizona for a few years too. I'm shocked Agilent did not make a WWP 100-150 volt version. .
@WakkoXtreme The base model 2000 unit is just US$1200
Nice blog. I can't really agree with you that you don't need 30v. 0-30v is really useful if you're working on power electronics from time to time :D
Dave, I know that you made sure to discharge those huge caps before working on the board, but you should have shown/mentioned it... keep the newbies from getting a wake up call...
O just brought one of these on eBay, 240v. Thank for the advise, I was tented to buy I Chinese cheepy for the same money shipped... :S
@WakkoXtreme Of course you'll pay that for a high end 1GHz mixed signal scope, Tek and other will be similar priced. What's your point?
nice videos
thank you NEW
There's one easy mod for this i see in the video, that is making external accessible "sens" inputs.
Hi,would you please tell me way my power supply shows 3.89 constant current with out testing anything,just plug it in and switch it on. thanks in advance.
@cumesoftware There you go, that's one of the few reasons. Sure there are some, the point is that most general purpose electronics work will be under 15V for the majority of people. YMMV as always.
Interesting video. I was trying to find the fullwave rectifier on the PCB (4x diodes close together). Is the power supply single wave rectified?
I knew someone would be smartarse enough to mention that :->
Horses for courses of course.
Did I care how much power the scope used when ON?
I agree. The ebay is flooded mostly with 120V models, and it is useless everywhere else. The lack of dedicated output on/off button, no external voltage sensing, no programibility via external interface (i.e. for programmed charging or measuring transient response of devices under test) and no way to easily change current limits on a fly without shorting output makes it meh in most modern labs.
Unless you need few good adjustable power supplies cheaply locally (no shipping and can make sure they all work correctly), buy something else.
I have a 2 E3615A power supplies. On on of them transformer sound is a bit louder (not very loud) than on other. Is this totally normal? Thank you!
@SergiuszB Try rewinding the transformer instead of the "transistor" (which is a solid state device by the way), just get an auto-transformer and get it over with.
EEVblog I've a simple question, I connected a galaxy note 1 smartphone to the same power supply as yours and was able to make it working by powering up from the supply not the battery. Although the battery of the galaxy device says 3.7V the phone could not start with voltage output set less than 5V. Also, I can see that the current is fluctuating when I do different activities on the phone (e.g Bluetooth search and browsing), while my volt output is set to 6V. Now, if the current is 0.9 for example, can I say that my power consumption in watts is 6Vx0.9A = 5.4 watts ??
Dave the youtube subscribe button is above your head.
Dave, have you seen the new Power Supplies from Tektronix/Fluke?^We bought one for our lab and it's magnificent. You should talk to them and get one to review!
16:00 so was this the first time you announced your full-time vblogging?
***** Possibly, don't recall, been too long ago now!
EEVblog All right, your risk (of going full-time video blogging) paid off and I hope you keep doing these videos for a long time to come
Though considering your newfound experience in video-reporting and giving talks, I bet you're offered a whole different sort of job
Australia have a balanced system with no neutral. Using a grounding conductor as a grounded current carrying conductor is a no no in most countries. Floating ground inside the unit is cool. The earth in European service mains is likely to be so unbalanced I doubt it will work.
My HP E3615A has selectable mains voltage, from memory it was just a link to be soldered on the board from the multi tap transformer.
Hi! I have two E3615A and in one of these 2 the transformer sound is a bit louder than in other one, is that normal? I know that linear power supplies produce transformer buzzing sound...
Yes I'd say its normal, sometimes it can be caused by poor mounting of the transformer or something in the enclosure reverberating the hum. I had that problem on my Fluke 45 and it would drive me nuts, turned out that the unit got slightly bent in shipping and doing some re-bending fixed it.
@@allansmith6140 Thank you for so fast reply :) I also think it is normal. I hope so. Maybe i should tighten the screws of the transformer.
Take the top off the unit and press on the transformer as its humming and see if it changes, its a mechanical issue. While you got the top off adjust the voltage display against an accurate reference, its quite an easy job and service manual is available on the net :)
I will add that cheap ass transformers can hum due to not having been potted properly at manufacture, but this being a HP I doubt it in this case.
my E3610A having issue where when i let go of the CC set button the display is not return to 0 right away but very slowly going down.... very slow
I love how this is retro yet I use the exact same one at school! lol
I realize I'm kind of off topic but does anyone know a good site to watch new movies online ?
@Abram Travis try FlixZone. You can find it on google =)
@Jonah Alec Yup, have been watching on FlixZone for since march myself :)
@Jonah Alec thanks, I went there and it seems like a nice service :D I really appreciate it!!
@Abram Travis glad I could help =)
@AllenKll they would have bleeder resistors anyway.
Cute toy! I have a 50V/20A (need 48V for my humanoid robot) bench supply not that much bigger.
I much prefer the coarse+fine 2-pot setup.
It's a lot quicker to change the voltage/current than a 10-turn.
You misssed the obivious solution - a 110 box (transformer) used by builders etc.
Cheap and can be used for other purposes- job done.
can I set the current limit on hp E3620A dual power supply? there is no current knod or current set button.
@eevblog
Is it just me, or is the audio a bit off sync? I noticed it in the beginnig when Dave's slapping the supply, as well in the solder paste dispenser video when he's lifting the magnetic holders.
Lets see back when I was in TV radio repair school in 1976 1977 we had HP power supply that used 220v AC 60hz and the out put went from 0 v to 1000 v ac or dc I was sitting beside a guy and he was playing around with it turned it up to 1000 and he tried to show off then it hit the Bench boom big arc and he got kicked out of the class Man those were the days.
Newer videos are 1080p now.
how practical is it to add a load switch to this power supply? is it as simple as internally connecting a properly rated switch to either of the +/- output posts?
neppy5 I would connect it via a relay...
+Andy Cristea
ye just a relay to the negative\positive binding post or a solid state relay if you dont want to hear the relay every time and your good to go
+the real illuminati thanks guys that was a good method. I actually ended up putting a switch inline on my red positive lead wire, so that acts as my "load switch", cheap and has worked pretty well for what I do
neppy5 putting a switch in series with the positive lead can create a forward voltage, depends on the switch you might lose even 100mV.. unless this psu has a sense wire I don't think it is the best solution. the reason for relay or even a mosfet is because relay typically are cheap and have a very low resistance compare to your on \ off switch.
but, if it works for you that's great :D
I know this is quite late, but can someone explain to me all disadvantages to not having a load switch? Greatly appreciated!
Same
I've got a Zhaoxin cheap sh*t supply that works just fine for me.
Who knows, maybe they really didn't want that one to be converted so that they could sell the 240V one at a different time and/or at a different price. Could have just been lack of foresight too, but you just never can know for sure what the logic is behind some corporate decisions.
So what are you going to do with it ?
You can use a TRIAC dimmer circuit to control the input voltage to 120V and I know that it is not recommended but none the less it works :)
did you just get this recently?
@gushhnet Hurr, of course I meant the transformer (I was tired when I watched this!). Don't get so upset :P.
@Afrotechmods so true
It will work in Canada - take it off the shelf - dust it off and ship it to me :)
That is a price of low noise.
Hey Dave, it seems I got first this time
These guys are on sale right now (in the US) on Grainger for reasonably cheap: www.grainger.com/product/AGILENT-TECHNOLOGIES-Power-Supply-3PGC4?s_pp=false
Yeah. Lie to me now, bitches.
If you really want to convert that supply, you could always rewind the transistor :P.
Lots of errors sorry lol
I got elenco power supply I need it for my cars
there was a lady ( or a "sheila"? ) beating up on one of these p/s's trying to open it on y-tube and it was quite disconcerting to me then she busted off the cc button on the front the animal
"It is a bit wasteful in terms of energy consumption (for a given output power) but , ehhh, who cares about that?" - Umm, the sorts of people who measure the standby power of their oscilloscpes?
@Afrotechmods Well, it could be done with another transformer(s), but it would be a VERY ugly hack. Not worth it.
@cd4600 Having your own company and "being your own boss" can suck a lot more time than a 9-5 job, been there, done that. That means less time for fun stuff like these videos. If I can possibly make a living from making these videos, why not?
First comment might be nice but the last comment is where it is at
What's it worth (09/29/2017) ?
First
Please don't be cute with the pointing. On the app I'm usung, you're pointing in all the wrong places. Not everyone is using the same app or website.