DIY power supply 8-30V 0.7A Model ELS 1012 Josty-Kit NT30 1975
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- Опубликовано: 11 июн 2024
- Super deep going restore project, took 3 nights to make :-)
Original design : Josty-Kit NT30 released in 1967
Electronic school copied the design and made this one,
I think this unit was made about 1973-75.
We dont know the school name or person who made this one.
Now it works SUPER good, amazingly good regulated, no ripple, or noise :-)
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#teardown
#restore
#vintage
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I use auto generated subs, i am sorry there are a few spelling errors,
maybe one day they can do it better..
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Well done Thomas - you've brought it back from the dead!
Wow! Beautiful restoration. I think it was very worthwhile.
Nice restoration project and dialog. Thx!
Nice one Thomas! 👍👍👍
Det er da fint nok at holde liv i det gamle elektronik. Fin restaurering.
One can always use one more power supply. Looks good now.
Phantastic job!!
The voltage regulator is a discrete op-amp with fairly high open-loop gain. T5 and T3 are common-emitter gain stages in series, T2 is the output follower stage of the op-amp; and T4 is the pass element driven by the op-amp. T5 is the differential input stage with gain, utilizing the fact that the Z1 voltage has a fairly low impedance compared to the source resistance of the feedback network R8,9,11.
T5 could be replaced by a differential pair, but the design has quite respectable DC performance as-is.
The current limiter is fairly ingenuous.
Worth restoring as it is a clever design. Good ideas are Worth preserving. I deal for a beginner power supply.
Thanks for the tips!
If I ever find a proper heatsink I might end up with a usable power supply ;) hehehehe
yes the size of the heatsink and transformator location, it is clearly not a workhorse unit.. but for small experiments it is still just fine
Yes, you went a bit over the top! So!
Nice work.
Yes! Thank you! i got carried away a day or two here.. hobby is hobby, you cant translate time to money, it is only a thing to entertain me :-)
Herligt. Jeg har ventet på at du lagde denne video op.
thanks a lot for identification and documentation
Acid in the paper did a trick on that chassis it looks like.
yes alu was really badly coroded, but sanding and a bit spray paint looks like it is nice again.
Really a cool restoration project, well done - But was it worth the time? Don't thinkl so ;-)
👍👍👍👍