Episode 1597 This is similar to the Kepco BOP units $3875 in 1984 ($11,000 in todays money) here I show current sink: • #1597a HP6826A Current... Be a Patron: / imsaiguy
Пікірлер: 54
@Runco99011 ай бұрын
Wow, that WAS a steal!!! They are asking between $300 to a GRAND for these supplies! I have had one on my wish list as well.
@jagmarc11 ай бұрын
These Kepcos are great versatile tools. My local components store here in Las Palmas has a Kepco like this on their shelves and no one working there knows what it is.
@jagmarc11 ай бұрын
And also a 4Q dynamic load KEPCO . Good for simulating noisy electrical load, PV solar array, dc electric motor
@Sigmatechnica11 ай бұрын
I have the 6825A, it;s a nice tool. knobs were all stuck on mine but a bit of heat applied to the shafts loosened thim up and they have remained fine since, which is good as these things are not built to easily service the rotery swithces.
@meh58311 ай бұрын
damnit, now i want one
@willthecat386111 ай бұрын
IMO, no you don't. You can buy a lot of other paper weights, for the price these go for.
@rankenfile11 ай бұрын
What a cool unit! Thanks for the demo.
@Pulverrostmannen11 ай бұрын
That is a neat device actually, I bet it is a great tool when working on amplifiers too when you design various stages in it etc. nice
@simontay485111 ай бұрын
wow, now that is nice! Thinking about how it works is making my head hurt. Its basically a programmable precision audio amp with controllable gain and active current limiting. I want one but i'll never be able to afford one. $65 is a steal! An LED 7 segment frequency meter on the front would be useful as the analogue meters obviously can't respond at high frequencies.
@mengisi11 ай бұрын
My favorite power supply now is Kenwood PD-18 30AD. Not vintage but the power is amazing.
@andymouse11 ай бұрын
Awesome steal, pure robbery !....cheers.
@zebo-the-fat11 ай бұрын
Nice piece of equipment. Minor niggle, it feels very wrong when you talk about "amperage" what's wrong with using "current"??
@IMSAIGuy11 ай бұрын
www.merriam-webster.com/dictionary/amperage
@andrewlecouteurbisson721711 ай бұрын
That is not four quadrant operation, nor was it sinking current in the normal sense. A proper four quadrant supply will act as an active load, which it may be capable of, but you didn't demonstrate that.
@IMSAIGuy11 ай бұрын
you are right I did not demo that, but it will act as a load. it is four quadrant. here is a video about: kzfaq.info/get/bejne/p6yGm8iQ2uDcnnk.html
@miguelmiguel731411 ай бұрын
@@IMSAIGuy Is easy to demostrate four quadrant operation with your tektronix 576
My apologies. As I too often do I didn't read all the comments before I posted mine. I too noted that it was not shown operating in four quadrants.
@TheEmbeddedHobbyist11 ай бұрын
Not seen one like that before, now if only i had a use for one it could be very useful. I've 3 switching PSU's which are good for lots of power in a small case, but if your doing ENC work you can't beat a analogue supply with an analogue meter, for low RF noise getting in to the test setup from your supply. Even the analogue ones with the led meter can be a bugger for noise.
@polaraligned111 ай бұрын
Very cool. Never seen one before.
@ivolol11 ай бұрын
-50 amps!! No wonder it's sought after 🤣
@robertmartin567911 ай бұрын
TEARDOWN !
@miguelmiguel731411 ай бұрын
there is a 6825 interiors, restoration in EEVBLOG
@JeepinBoon11 ай бұрын
My first thought was just buy a Crown DC-300.... After checking epay prices, no don't.
@alklapaxida85011 ай бұрын
i must get one of these,,,
@johnwest799311 ай бұрын
Nice! I'm quite jealous. :) I think you meant to say 50 'watts', not 'amps' at 3:28. Also, at 8:53 and 9:07. I think you meant to say 'triangle' wave, not 'sine'.
@chongli29711 ай бұрын
Really sweet! I love the sandy texture of the cast metal body. I have an old HP power supply with the same body panels and same banana jacks. The meter movements on mine are stuck at 0 volts though! I am wondering if it's worth it to crack the thing open and try to fix them.
@@IMSAIGuy I think that this power supply uses taut band
@paulperano923610 ай бұрын
Very heavy, but often very low on noise. As opposed to SwitchMode noise generators. Hhhmmm that could a good item. How to clean-up your SM DC output. 🙂
@georgesampson471411 ай бұрын
OK, do you supply napkins with this video so all of us viewers can wipe up our drool? Now I have to find a schematic to see how they do this magic.
@FirstLast-ih6ec11 ай бұрын
Is this really a four quadrant supply? If the voltage and current have the same sign, this can be at most a two quadrant supply.
this is how to use 4 quad; kzfaq.info/get/bejne/p6yGm8iQ2uDcnnk.html
@IMSAIGuy10 ай бұрын
current sink: kzfaq.info/get/bejne/htOkjNhztbC3pIk.htmlsi=fDC-6op2qBGqAYSk
@Gengh1311 ай бұрын
Up to 40khz, that's nice.
@miguelmiguel731411 ай бұрын
You can do a video calibrating the zero adjust...:) Mine costs 250€ each with sipping to spain, and they were not working
@max_destro11 ай бұрын
I love your channel but it's often difficult to listen to on headphones, as your voice is coming from one side. Perhaps consider recording in mono. Keep up the great work!
@davidtzaig594711 ай бұрын
How does it sound as an audio amplifier?
@miguelmiguel731411 ай бұрын
I have two of them, one for 120V and other for 24V and I use them instead a regular power supply ,why? they dont have a electrolitic outuput capacitor, not capacitor discharge when you do the things bad. They can be used as a battery simulator too. Is a very usefull tool
@rfburns560111 ай бұрын
Will this replace my McIntosh MC-1200? Its got two meters on it! Ha! Woulda been cool to see it hooked up to a speaker, and play your Iphone thru it.
@GJackie2411 ай бұрын
Is that like a SMU type device without the amplifier part ? Source Measurement unit is a (4) quadrant device I think...
@IMSAIGuy11 ай бұрын
I guess it is a SU not a SMU. more about SMU: kzfaq.info/get/bejne/p6yGm8iQ2uDcnnk.html
@nnamrehck11 ай бұрын
Do you know the way to San Jose?
@d614gakadoug910 ай бұрын
At 3:40 in, the instrument has not been demonstrated to be capable of sourcing or sinking current or operating in four quadrants. It has only been shown to operate in quadrants 1 and 3, sourcing only in each. No "sinking" capability has been demonstrated. "Sinking" means that instead of current flowing out of the output terminals, it can flow in to maintain the voltage setpoint. The specifics of polarity of the setpoint are essentially ignored with this terminology. Considering the case with the supply set to deliver a positive voltage at the "red" terminal relative to the "black terminal" : An ordinary power supply will go high-impedance at its output if something external to the supply forces the output voltage to be above the setpoint of the supply. With current sinking ability, the instrument will actively try to bring the output voltage down to the setpoint by causing (conventional) current to flow into the red terminal - it behaves as either a series regulator or a shunt regulator, depending on specific conditions. That is operation in quadrant 2. With the relative polarity of the terminals reversed, operation is in quadrant 4. The non-square limitation in quadrands 2 and 4 is almost certainly due to the safe operating area limitations of the output transistors. Because sinking is to the opposite supply rail, the voltage across an output transistor could approach twice what it might see if used only as a normal series pass element. Basically these power supplies are very very similar to audio amplifiers, the major difference being that they incorporate a bipolar voltage reference and some convenient bells and whistles.
@IMSAIGuy10 ай бұрын
As in comments below, I did not demo the four quadrants. Please read the User Manual for this product. It will explain it will in fact source and sink current. www.keysight.com/us/en/assets/9018-02032/user-manuals/9018-02032.pdf
@IMSAIGuy10 ай бұрын
I show current sink: kzfaq.info/get/bejne/htOkjNhztbC3pIk.htmlsi=fDC-6op2qBGqAYSk
@gamerpaddy11 ай бұрын
how hard can it be putting a current limiting circuit into a powerful audio amp and call it a psu
@JaenEngineering11 ай бұрын
Very. Loudspeakers don't really like DC of any sort. As a result pretty much every audio amp will have an AC coupled design so it wouldn't really work without a pretty big redesign. Add to that the power rating of audio amps are for RMS/peak AC, so continuous DC is likely to cause problems with dissipation in the output transistors.
@EssArrB11 ай бұрын
Yes, just what I was thinking. DC couple it, add support circuitry for all that switching and metering, decent heatsinking, etc.
@brainndamage11 ай бұрын
The output stage on most class AB amps is DC coupled. But it would be very hard to make it have an adjustable and precise current limiter.
@jimomertz11 ай бұрын
Didn’t anybody notice the the price on the sheet? $3,875 🤯. Was that in 80’s dollars? 😱. Don’t you have a Keithley source meter? Doesn’t that do the same thing and is far superior?
@IMSAIGuy11 ай бұрын
yes, in 1980's dollars! the Keithley will not do 50V at 1amp. I am not aware how to use the Keithley as an amplifier.
@multiforc27111 ай бұрын
is there a way that i can contact you ? i am selling some old equipment of our company, they are bunch of controllers, sensors and etc. for ultra high vacuum. maybe you know a buyer or u r interested