Thank you all for the kind comments and happy new year! One note to add to avoid confusion: Instead of thinking in terms of parallel/series of winding, we can note that the input consists of an auto-transformer followed by a regular two-coil transformer. The auto-transformer provides variable ratio while the regular transformer provides the isolation. Please note that the auto-transformer itself provides no isolation as it only has a single coil where all three terminals are electrically connected.
@pdgiddie5 жыл бұрын
I'm wondering if there's a particular reason why the two transformers are that way round: I'm putting a separate Variac and isolation transformer together myself, and I can't think of any reason why the isolation transformer could not come before the Variac, which is actually more convenient for my setup. Are you aware of any reason the Variac should come first?
@pepper6697 жыл бұрын
I like the human interface of this device, everything is so nicely and so clearly labeled.
@geekchenxiang7 жыл бұрын
wow. finally updated. could you do a tour of your new home lab ?
@Thesignalpath7 жыл бұрын
Chenxiang Hsu sure. As soon as it is setup.
@PapasDino7 жыл бұрын
Great to have you back again...very Happy New Year!
@johncunningham54356 жыл бұрын
These are great isolation transformers; bought mine years ago. "Excellent presentation" you won't be disappointed with this gem.
@mcintoda97 жыл бұрын
So happy to have you back
@yoksel997 жыл бұрын
Whenever I need an isolated mains socket, I use one of those cheap car invertors that make 120V AC out of 12V DC. I get 12V for it from my lab power supply. The resulting AC is not the best in shape, but fits most of the purposes such as fixing the power supply of some home consumer electronics.
@henkvandeleur68727 жыл бұрын
A very good new year and good to have you back again with new videos.
@xDevscom_EE7 жыл бұрын
Yay, The SignalPath Video! What a great beginning of 2017 :) Wish you all the best, and more great vid's ;).
@catt877 жыл бұрын
Nice to have you back. Really looking forward to all the nice videos that will be coming.
@rubusroo687 жыл бұрын
So good to see you back, Happy new year!!!
@daveblane64427 жыл бұрын
YAY!!1 HAPPY TO HAVE YOU BACK, SHARIAR!
@Corgitronics7 жыл бұрын
I'm looking forward to seeing more tests using the Sencore unit. As a longtime subscriber I am pleased to become a patreon supporter of your channel!
@johnnymartini10727 жыл бұрын
Happy new Year!! nice to see you back :)
@tedfrisk47307 жыл бұрын
Thanks Sir , I'm happy to see you back with new project again..Wish you a happy prosperous start on the new year
@gohn3057 жыл бұрын
Great to see you again....
@gettingoldsuckss Жыл бұрын
Very interesting, they have the variac before the 1:1 isolation transformer. I guess that works and I'm sure they did it like that for a reason.. I am planning to make something sim. but with rectification for DC output as well as the variable AC. Also plan on doing some very stable 3.3, 5, and 12v outputs, also thought about figuring out way to do bipolar tracking DC outputs.. Anyway in my head I was planning to start with isolation transformer followed by Variac
@stevefoudray4875 жыл бұрын
Sencore had a parallel company called BAPCO. The equipment was in the biomedical market. A 20amp version of the PR570 was produced. I found 2 for my audio amplifier shop!
@billmoran38126 жыл бұрын
Remarkably similar in design to a variable isolation supply I am building. I put a load resistor that I can switch in series with the output to protect against a short in the DUT. I used commercially made voltmeter and ammeters for monitoring, and a bar graph indicator to show voltage across the load resistor. The variable voltage is via a variac which is a variable auto transformer, same as in your unit.
@jaa939977 жыл бұрын
Nice to see you back ☺
@jmanatee7 жыл бұрын
Glad to see you back,
@Newsparklabs7 жыл бұрын
Another great video, Thanks Shahriar!
@grantfullen95597 жыл бұрын
Glad to see you back :) I love your repair videos.
@dazaro37 жыл бұрын
Have a great new year
@fishyrider35287 жыл бұрын
hey. welcome back:) we missed u.
@DavidLeeMenefee7 жыл бұрын
Well come back! Thumbs up.....PEACE
@idooggoodi7 жыл бұрын
Happy New year Shahryar, finally updated. please also post a video about high speed PCB simulation software tutorial.
@KD0CAC7 жыл бұрын
Finally , I had gone through withdrawal from being addicted to your channel ;) Now I will be hooked again , doggy dew ;)
@IanScottJohnston6 ай бұрын
It's a shame there doesn't appear to be a 240VAC version of this unit.
@HINKSWE7 жыл бұрын
Welcome back and happy new year
@georgegiorgio75246 жыл бұрын
Very good information on all your videos.
@PeterCut627 жыл бұрын
Happy new year. Welcome back ;-)
@Unknownety7 жыл бұрын
If I designed that for the 110-120 volt market, I would have made the main transformer into a 1:2 turns ratio, so that one could output 220-240 +the extra that the variable transformer gives. Maybe split the 1:2 ratio into two taps, so one could select 1:1 or 1:2, so we could use thicker wire for the 1:1 to get better current carrying capability if needed.
@teemoinvietnam13567 жыл бұрын
Oi vey! I thought you were dead... after waiting like 6 million years! I like your videos, senpai ~
@MauroSedrani7 жыл бұрын
welcome back and New Year!
@martijn47407 жыл бұрын
Finaly a new video
@peterhansen82167 жыл бұрын
welcome back.
@pufero17 жыл бұрын
welcome back
@josephcote61206 жыл бұрын
I have a question I'd like to throw out. I have a Heatkit IP-5220, same basic design, simpler metering. The topology is the same, Variac first from the mains, then the isolation transformer, to the power outlets on the front of the unit. There is also a direct non-isolated utility outlet on the front. The main fuse for the unit is 7 amps. The variac is rated for 3 amps. Output metering/fusing is switchable for 1 or 3 amps. Just want to give as much info as possible about the unit. What I would like to do is reconfigure it so that the iso trans comes first, the output of that goes to both the variac and one of the power outlets to provide direct line voltage isolation,. The out put of the variac to the other power outlet for variable voltage. The question is, will I run into trouble swapping the order of the variac and iso trans? What considerations go into putting them in a particular order?
@CAHSR20207 жыл бұрын
This is quite a surprise. I thought you had vanished into a distant sunset never to return.
@JJayzX7 жыл бұрын
cat still being a cat as per usual, things seem good.
@gettingoldsuckss Жыл бұрын
What is the amperage of the output? Variac looks small..
@kirkpennock29977 жыл бұрын
do you use deoxit fluid on pots and crusty conections? it works very well.
@JustinAlexanderBell7 жыл бұрын
11:23 Kitty
@fohdeesha7 жыл бұрын
is it just me or was the repair part totally missing? either way thankful for a new video
@Thesignalpath7 жыл бұрын
Jon Sands I am sorry, I explained in the video that all I had to do was to re-insert the LCD module to fix the contact problem.
@fohdeesha7 жыл бұрын
Oh oops, I must have blacked out during that bit, all I remembered was you mentioning they turned out not having a zebra connector. Watching it again and of course now I hear it. Thanks!
@movax20h4 жыл бұрын
Hi. I wonder if there are other options than this PR570 available on the market or used? I am primarly interested in 230V input and 0V-270V output. 1000VA would be enough. Something that has nice display with all measurements shows at the same time, less knobs, and active output regulation, so the output is stable even if the input varies, and output relay cutoff if the regulation can't be performed. The PR570 is really dated, looks like a design from 80s probably. And it doesn't have active regulation. So you probably should stick input it into inverter or automatic voltage regulator. The PR570 also looks like a really low power, maybe 400W? That can be done this days easily using solid state inverter instead with very little cooling.
@BJcanal270Ай бұрын
I wish I can effort one
@pnjunction56897 жыл бұрын
Happy new year! Does it matter whether you put the variable transformer on the primary or the secondary side of the isolation transformer?
@smudgerdave11417 жыл бұрын
No and in fact if you put the variable transformer after the safety isolating transformer, you can double-isolate the control electronics as a bonus.
@anthonynowlan97657 жыл бұрын
Hey mate, Siglent Spec Analyzer review coming?
@jaywalt13117 жыл бұрын
What do you mean "short videos will not be charged to patreon"?
@Thesignalpath7 жыл бұрын
Jay Walt my Patreon account is based on episode production. But I didn't want to charge my supporters for the "short" videos, so I won't apply those to the Patreon account. You can tell which videos are marked short by the name of the video.
@astalavistatomi3 жыл бұрын
Hello Shariar, is there any replacement for this device (something similar like that)? This one is too hard to find anywhere. Thank You
@Thesignalpath3 жыл бұрын
This is discontinued unfortunately. I am repairing another unit to replace this one in my lab. It is a very sophisticated unit if I can fix it.
@astalavistatomi3 жыл бұрын
@@Thesignalpath There will be video of this repair?
@Thesignalpath3 жыл бұрын
@@astalavistatomi Yes.
@gacherumburu9958 Жыл бұрын
👍👍
@John_Ridley7 жыл бұрын
Your cat is defective. They're supposed to stop right in front of the camera.
@markputham29607 жыл бұрын
Yes, but what happens when you try to charge your iPhone with 300v?
@Thesignalpath7 жыл бұрын
mark putham not good things. ;)
@NeuroMod7 жыл бұрын
What makes the variac and main transformer to be in parallel? I would call it serial.
@smudgerdave11417 жыл бұрын
Parallel/serial does not apply. The variac output supplies the isolating transformer primary. Also, the variac is an autotransformer - it does not have a primary or secondary and therefore does not have a turns ratio, it has a tapping ratio.
@Thesignalpath7 жыл бұрын
Instead of thinking in terms of parallel/series of winding, we can note that the input consists of an auto-transformer followed by a regular two-coil transformer. The auto-transformer provides variable ratio while the regular transformer provides the isolation. I added a note to the video to avoid confusion. Please note that the auto-transformer itself provides no isolation as it only has a single coil where all three terminals are electrically connected.
@zaidhussain52067 жыл бұрын
Can you please share the schematic if the devices you showing in the video ?
@DandyDon16 жыл бұрын
I found the op manual here which contains the circuit diagram. drco.pairserver.com/manuals/PR570-OSM.pdf
@Hatimoooo7 жыл бұрын
Are you sure about the fact that the iPhone charger is a buck converter? Considering that it is easy to access its terminals, some kind of isolation is definitely needed for people's safety. I'm voting for a flyback but I'm not sure. Can you confirm this? Thanks
@Thesignalpath7 жыл бұрын
Hatimoooo I think you are right. It is definitely transformer based.
@OnTheRocks717 жыл бұрын
omg. Yay!
@rbelward7 жыл бұрын
woo hoo
@Ozziepeck117 жыл бұрын
"it's functional, but it has a small problem" and that works how exactly?
@ianshepherd9173 жыл бұрын
You are still speaking far too quickly - SLOW DOWN please!