My three Farnell PSUs (one of them the later LT30-2) have served me unfailingly for more than 35 years, the only failure I had was an LED on one of the power switches. Great units!
Thank you. That's a shame about not being able to get decent test equipment in Brazil. Thanks for watching. Obrigado. É uma pena não conseguir equipamento de teste decente no Brasil. Obrigado por assistir.
Thank you. I see you have repaired quite a few Farnell power supplies on your channel, and yes I have seen your workbench, lol. Just wondering how you managed to find a space for all the stuff donated in those 6 large boxes, lol. We have one of your PDVS2 Mini's here. What a really great bit of kit!!
Nice to hear you have a PDVS2mini, hope it’s serving you well. I decanted a lot of the 6 boxes into my own storage, but some stuff is in another workshop I have. Lots of stuff, especially the electronic components has already come in real handy as you’d imagine.
That's because in those days the boards were hand drawn/taped out on a transparency then photographically reduced down to be put on the etch resist. No fancy PCB design software in those days.
You were fortunate that you didn't have to give the pots a good clean, or even replace them. I have a couple of the single output PSU's. Both of them have suffered with dirty/worn pots. As simonstroud2555 said earlier, it's unnerving trying to set the voltage to, say 5v & the output is jumping up & down as you try to set it. I also wrongly assumed you must be a cat owner. 🐱😄
Thank you. It does take a lot of effort to make a good video with no fluff in it but I think it is worth it to do it properly and make it more enjoyable o watch. Thanks for watching.
Top jab Jazzie! If I ever make it to England I will bring you some of my spare heat guns. So we can watch them shrinking stuff shrink the way they are intended to.
@@JazzyJane_uk I've giot a big heat gun, about the size and shape of an old-fashioned hair drier, but what I really want is one of those "hot air pens" that Big Clive uses. Some day I'll get one.
Thank you. I'm glad you enjoyed it. Plenty more to come. I got scratched badly on some brambles at work. It's not a cat like some people have suggested, lol. Thanks for watching and thanks for the sub.
Maybe not quite as old as you thought it was as the orange caps you replaced were dated Apr 73 (3:40 time line). I also remember that standard issue grey 5 amp cable from my working days in the 70s/80s. We had the dual Farnell in our workshop around that time. Nice repair
That was a bit harsh replacing capacitors with RS ones. Would have been fairer to keep it pure Farnell by fitting some Multicomp Pro replacements. Anyway, a couple of bad experiences I've had with similar Farnell bench supplies over the years (not that exact one but similar very heavy linear 30V models) .... 1) when the pots go dodgy the output voltage can flail around rather randomly. Putting 30V up something unexpectedly can be fun. 2) the handles on top can just tear off if you quickly lift it off the bench.
Multicomp Pro tends to source the cheapest noname Chinese capacitors nowadays. Even these 'new' 35-40 years old replacement RS caps from Matsushita might last longer.
Lol, I never gave it a thought. I just had the RS ones to hand. Are Farnell and RS still arch enemies, haha. 1) I'm sure I looked at the pots and they were wired as variable resistors with the wiper tied to one end of the track so they shouldn't suffer an open circuit but I suppose the full value resistance might mean full voltage though. 2) I took the handle off as I wanted to stack other stuff on top, but it wasn't in the best of condition.
Do you find you can get away with in-circuit ESR measurements or do you disconnect them ? I've got this valve scope to restore and I don't fancy pulling them all out with their wrapped-around-the-tags fiting :)
It's good for electrolytics and some smaller solid capacitors. You can measure them in-circuit. The thing with valve equipment is that often with wax coated paper capacitors the wax has cracked/fallen away and moisture has got in, so they are leaky and no good. Also hunts electrolytics are notorious for drying out and failing. So I would say rule of thumb with valve equipment, change wax coated capacitors for a more modern high voltage polycarbonate or polypropylene capacitor. Hunts electrolytics have them out and change them. Any other caps/brands, visual inspection first, change leaky or damaged/cracked ones and go from there.
When you replace the other switches, are you going to modify the circuit to increase the max current? 1A is not very much. If you need some relays, I have lots of 12V coil 4 pole double throw relays. Would you like to buy 2?
The whole supply is only designed for 1A. Increasing it would require a new more heavy duty transformer, bigger smoothing caps, bigger output pass transistors, recalibration of the current scale and circuitry etc. So it's not practical. This supply is ideal for audio work. I have higher power supplies for other stuff. I already have some relays on order but thanks for the offer.
What did you do to your hand Jane? It looks like my hands and I work with a lot of sheet metal… Can you tell me where to find a tee-shirt like the one you’re wearing? My neighbours daughter is taking electrical engineering at uni and that would be a perfect Christmas gift… Did you test those big blue capacitors for ESR and leakage before and after? I’ve tried reforming them in the past but I find it can be hit or miss with that. Good video, thanks!
I got caught up in an unfortunate bramble at work! Bit prickly! I got the T-shirt from Amazon, I'm always looking out for electronics related T-shirts! I got lucky this time with reforming those caps, it doesn't always work but readings seemed within what I was expecting so happy days! Here's the link to the T-shirt: www.amazon.co.uk/Ohms-Diagram-Electrical-Electronics-Engineer/dp/B0CH7C5Y9V/
The unit didn't have toggle switches in originally. It had long thin black rocker switches. The switches I got were as close to the originals that I could get as I wanted to try and keep it as original as possible.
Lovely old supply, used one for many years at work as many of us did ! after your TLC it will outlive us all !
They were well built and built to last. Thanks for watching.
I remember those in the 1970s and 1980s. Hard to beat those linear PSUs after that many years.
My three Farnell PSUs (one of them the later LT30-2) have served me unfailingly for more than 35 years, the only failure I had was an LED on one of the power switches. Great units!
They are great power supplies and very well made. I really like them. Thanks for watching.
Great restoration video! I love those old linear supplies, much cleaner output than modern cheap switching supplies.
You can't beat a good linear supply. This one is old but it's so well built that with my repairs it's still working very well after all this time.
Parabéns pelo conteúdo, infelizmente aqui no brasil equipamentos com essa qualidade são muito difíceis de encontrar. Belo trabalho, parabéns!
Thank you. That's a shame about not being able to get decent test equipment in Brazil. Thanks for watching.
Obrigado. É uma pena não conseguir equipamento de teste decente no Brasil. Obrigado por assistir.
Nice video. Didn't see notice cool the t-shirt until the end.
Thank you and thanks for the sub.
Nice to see these old Farnell psu’s coming back to life, and you are right you can’t have enough psu’s…….LOL , you should see my workbench!
Thank you. I see you have repaired quite a few Farnell power supplies on your channel, and yes I have seen your workbench, lol. Just wondering how you managed to find a space for all the stuff donated in those 6 large boxes, lol.
We have one of your PDVS2 Mini's here. What a really great bit of kit!!
Nice to hear you have a PDVS2mini, hope it’s serving you well.
I decanted a lot of the 6 boxes into my own storage, but some stuff is in another workshop I have. Lots of stuff, especially the electronic components has already come in real handy as you’d imagine.
I like how the traces curve gently around the PCB, very Art Nouveau
That's because in those days the boards were hand drawn/taped out on a transparency then photographically reduced down to be put on the etch resist. No fancy PCB design software in those days.
@@JazzyJane_uk It's like dave-cad for PCBs
You were fortunate that you didn't have to give the pots a good clean, or even replace them. I have a couple of the single output PSU's. Both of them have suffered with dirty/worn pots. As simonstroud2555 said earlier, it's unnerving trying to set the voltage to, say 5v & the output is jumping up & down as you try to set it.
I also wrongly assumed you must be a cat owner. 🐱😄
Definitely a nice unit - should come in handy for op-amp electronics! I love how clean it is built.
It's old but it's very nicely built.
Very well produced video, great job!
Thank you. It does take a lot of effort to make a good video with no fluff in it but I think it is worth it to do it properly and make it more enjoyable o watch. Thanks for watching.
Nice pair of meters there, Jazzy. Nice repair too.
Lol, thank you.
Nice repair! 😮😊
Thank you.
Top jab Jazzie! If I ever make it to England I will bring you some of my spare heat guns. So we can watch them shrinking stuff shrink the way they are intended to.
Yes I should get one.
@@JazzyJane_uk I've giot a big heat gun, about the size and shape of an old-fashioned hair drier, but what I really want is one of those "hot air pens" that Big Clive uses. Some day I'll get one.
Great meters there Jazz, love your content, keep it coming ;) Seems you have some battle scars on your left hand lol
Thank you. I'm glad you enjoyed it. Plenty more to come. I got scratched badly on some brambles at work. It's not a cat like some people have suggested, lol. Thanks for watching and thanks for the sub.
Maybe not quite as old as you thought it was as the orange caps you replaced were dated Apr 73 (3:40 time line). I also remember that standard issue grey 5 amp cable from my working days in the 70s/80s. We had the dual Farnell in our workshop around that time. Nice repair
Yes you are right. The design was done a few years earlier than the production of this one. Thanks for watching and thanks for the sub.
Wonderful vid ,gives me confidence to have a go on my power supply. Cat lover I take ?
What makes you think she's a cat lover? There was no cat in the video.
Thank you, best of luck with your power supply! Not cat related but I got caught up in a nasty prickly bramble at work!
That was a bit harsh replacing capacitors with RS ones. Would have been fairer to keep it pure Farnell by fitting some Multicomp Pro replacements.
Anyway, a couple of bad experiences I've had with similar Farnell bench supplies over the years (not that exact one but similar very heavy linear 30V models) ....
1) when the pots go dodgy the output voltage can flail around rather randomly. Putting 30V up something unexpectedly can be fun.
2) the handles on top can just tear off if you quickly lift it off the bench.
Multicomp Pro tends to source the cheapest noname Chinese capacitors nowadays. Even these 'new' 35-40 years old replacement RS caps from Matsushita might last longer.
Lol, I never gave it a thought. I just had the RS ones to hand. Are Farnell and RS still arch enemies, haha.
1) I'm sure I looked at the pots and they were wired as variable resistors with the wiper tied to one end of the track so they shouldn't suffer an open circuit but I suppose the full value resistance might mean full voltage though.
2) I took the handle off as I wanted to stack other stuff on top, but it wasn't in the best of condition.
@mrnmrn1 'NOS' New Old Stock, lol.
Do you find you can get away with in-circuit ESR measurements or do you disconnect them ? I've got this valve scope to restore and I don't fancy pulling them all out with their wrapped-around-the-tags fiting :)
It's good for electrolytics and some smaller solid capacitors. You can measure them in-circuit. The thing with valve equipment is that often with wax coated paper capacitors the wax has cracked/fallen away and moisture has got in, so they are leaky and no good. Also hunts electrolytics are notorious for drying out and failing.
So I would say rule of thumb with valve equipment, change wax coated capacitors for a more modern high voltage polycarbonate or polypropylene capacitor. Hunts electrolytics have them out and change them. Any other caps/brands, visual inspection first, change leaky or damaged/cracked ones and go from there.
When you replace the other switches, are you going to modify the circuit to increase the max current? 1A is not very much. If you need some relays, I have lots of 12V coil 4 pole double throw relays. Would you like to buy 2?
The whole supply is only designed for 1A. Increasing it would require a new more heavy duty transformer, bigger smoothing caps, bigger output pass transistors, recalibration of the current scale and circuitry etc. So it's not practical. This supply is ideal for audio work.
I have higher power supplies for other stuff. I already have some relays on order but thanks for the offer.
Great job as usual. I want a shirt like that one lol What did you do to your left hand?
Thank you :) I found that T-shirt on Amazon, couldn't resist lol. I got caught up in a rather nasty prickly bramble at work, bit ouchy!
What did you do to your hand Jane? It looks like my hands and I work with a lot of sheet metal…
Can you tell me where to find a tee-shirt like the one you’re wearing? My neighbours daughter is taking electrical engineering at uni and that would be a perfect Christmas gift…
Did you test those big blue capacitors for ESR and leakage before and after? I’ve tried reforming them in the past but I find it can be hit or miss with that.
Good video, thanks!
I got caught up in an unfortunate bramble at work! Bit prickly! I got the T-shirt from Amazon, I'm always looking out for electronics related T-shirts! I got lucky this time with reforming those caps, it doesn't always work but readings seemed within what I was expecting so happy days! Here's the link to the T-shirt: www.amazon.co.uk/Ohms-Diagram-Electrical-Electronics-Engineer/dp/B0CH7C5Y9V/
You could have use C&K 7101 or 7201switches, they have the same dimensions as the old ones.
The unit didn't have toggle switches in originally. It had long thin black rocker switches. The switches I got were as close to the originals that I could get as I wanted to try and keep it as original as possible.
Left hand...panel rash or cat ?
I got caught up in a bramble whilst at work! Looks worse than it was, all good now!