LM337 is even more vicious. Marginally stable on a good day and the pins are different to the 317. Guess how I discovered the latter
Edit: Oh random thought today. I am giving up on hamfests now. Possibly permanently. I'm just about done with the whole ebay bouncing business and want to get on with making stuff now. That does not preclude my exit from the glorious TEA thread for I will still look on ebay
This supply nearly 30 years old. Designed and built by yours truly. It has 3 - LM317's and 1- LM337. And it's in daily operation powering scanner accessories. Never an issue.
LM337 is even more vicious. Marginally stable on a good day and the pins are different to the 317. Guess how I discovered the latter
And just the other day I ogled a diy PSU design using both, 317 and 337. Somehow, I thought they'd been a tad gung-ho about it; they had based it on a 2x24V transformer, relying on the peak voltage post-rectifier to get to 2x30. Not very confidence-inspiring.
I could really do with a single 50+V PSU; does not have to be much current (probably OK with 500mA). But, cheap is good ;-) Anyone got anything they'd part with?
I avoid games of chance where possible
Just seen my next car on ebay: https://www.ebay.co.uk/itm/313016881099
The creator seems to be misinformed on the heat resistance of plastic rear lights. I think I would have extended that aluminium cladding a tad further back.
McBryce.
LM337 is even more vicious. Marginally stable on a good day and the pins are different to the 317. Guess how I discovered the latter
And just the other day I ogled a diy PSU design using both, 317 and 337. Somehow, I thought they'd been a tad gung-ho about it; they had based it on a 2x24V transformer, relying on the peak voltage post-rectifier to get to 2x30. Not very confidence-inspiring.
I could really do with a single 50+V PSU; does not have to be much current (probably OK with 500mA). But, cheap is good ;-) Anyone got anything they'd part with?
Ugh I bet that got a bit lumpy with some load. Mains variation + transformer load + diode drops + capacitor charge drop = headache.
Any good?
https://www.ebay.co.uk/itm/183713821017
Freaking engineers.
Don't you guys ever look at the data sheets?
I could really do with a single 50+V PSU; does not have to be much current (probably OK with 500mA). But, cheap is good ;-) Anyone got anything they'd part with?
Ugh I bet that got a bit lumpy with some load. Mains variation + transformer load + diode drops + capacitor charge drop = headache.
Any good? https://www.ebay.co.uk/itm/183713821017
That would fit the bill, yes. Bit expensive shipping, though. (56 bleeping quids...)
Ah, yes, driving that is a game of chance like the 1995 Darwin Award
https://darwinawards.com/darwin/darwin1995-04.html
(yes i know that and that, but I'm not going to let that get in the way of a fond memory )
One should never let the facts get in the way of a good story.
Looks like my new toy escaped just in time...
"Ramco Ltd to temporarily close. Following the Government's recent announcement we are closing the doors until further notice. No further collections or deliveries will be accepted. Any equipment you have either purchased or placed into one of our auctions will remain in our care until this National Emergency has passed and we can reopen."
Not unreasonable
Hadn't heard Rigol were that bad.
I certainly won't be buying a Feeltech...
I'll just have to be patient and wait to get lucky on ebay, since I can't afford anything remotely new from a decent brand.
LM337... the pins are different to the 317. Guess how I discovered the latter
I've discovered that the hard way too, fortunately I figured it out before the magic smoke escaped. Although there's only about £0.10 worth of magic smoke in an LM337 its still nice to not have to replace the only one you had to hand at the time. (Just checked, it's actually £0.60-0.70 worth of magic smoke, but the principle still applies.)
Hello mnem,
I recently purchased an EDS-88A. It seems pretty nice and since it is for my business, it is a tax deduction. I didn't mind the cost and it seems real nice. I see you also link to the ESR70 too. I may order one of those as these type of devices fascinates me, for what ever reason - simple minds are easily amused LOL.
Do you have much experience with the ESR70? It looks good. I find them for anywhere from $95 (shipping from the US) to $140 (also shipping from the US). I don't know why there would be a $50 difference in where you purchase from. Of course, my brain says buy the cheapest; my gut says to investigate further.
The EDS system machines rely on precise gold plated probe. The other just have regular tin plated clips. Perhaps this is why my experience with ESR machines has been so-so, and actual replacement is the best cap test.
I have an Agilent 4362B and the Kelvin Clip assembly (!!!). I found any cheap ESR meter so much easier to use and rarely fire up the Agilent 4362B. Perhaps it is the Kevin 16089C only using tin plated clips? We are talking very low resistance when measuring ESR.
I have also ordered everything needed (Case, PCB, parts kit, and gold plated probe) to build the EDS-89A Short finder. Do you have any experience with it? There is a youtube video showing the use of the older EDS-88A short finder. It seems amazing. You get a short anywhere on a power rail, it can be impossible to find the short without cutting traces and these days with 6 layer boards, that is mostly impossible. We are talking milli-ohms, or less, in trying to track down shorts. So, I am anxious to try that out too.
Take care and stay safe from the Covid-19 virus.
Dave
Looks like my new toy escaped just in time...
"Ramco Ltd to temporarily close. Following the Government's recent announcement we are closing the doors until further notice. No further collections or deliveries will be accepted. Any equipment you have either purchased or placed into one of our auctions will remain in our care until this National Emergency has passed and we can reopen."
Not unreasonable
Not unreasonable until you find the buggers have charged you storage fees.
Hadn't heard Rigol were that bad.
I certainly won't be buying a Feeltech...
I'll just have to be patient and wait to get lucky on ebay, since I can't afford anything remotely new from a decent brand.
TBH I'm mostly being unfair. The absolute bottom end Rigols are decent quality, just the user interface is a complete ball bag from end to end. They work fine if you can stand some suffering on that.
Also new price is pretty good and you can crack it to two channels and 100MHz as it's exactly the same hardware as their highest end unit:
https://www.telonic.co.uk/Rigol-DG811-Waveform-Generator-p/dg811.htmI only bought mine because it was crackable
Looks like my new toy escaped just in time...
"Ramco Ltd to temporarily close. Following the Government's recent announcement we are closing the doors until further notice. No further collections or deliveries will be accepted. Any equipment you have either purchased or placed into one of our auctions will remain in our care until this National Emergency has passed and we can reopen."
Not unreasonable
Not unreasonable until you find the buggers have charged you storage fees.
"I came to pick up the X but there were none of your staff to give it to me".
Nonetheless I'm glad Equipnet haven't got back to me w.r.t. my
very lowball bid. Before placing the bid I asked them about what would happen if there was a CV lockdown; they didn't know.
Moved a few weeks ago, now I've got some extra space so the home lab gets to stretch its legs.
I'm a little late, but:
You've got a great bench there!
I wish I had so much space and wouldn't have to use the high ceiling in my apartment.
There's only one thing better than bench space: even more bench space.
Mmmm caravan. Now that's a good idea.
Just had to fettle with the 3d printer properly for the first time. New nozzle, levelling and clean the bed. Printing a custom enclosure for my pulse oximeter.