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Repairing an Oltronix B602D Power Supply  This is a repair/maintenance description of a 70's linear bench power supply. Oltronix LABPAC B602D. I bought this old power supply from a scrap dealer. Haggled a bit and got a good price. It's a nice 70's linear laboratory power supply with two channels, 0-30V 1.4A and 0-60V 0.7A. The two channels are fully independent with isolation voltage between them and chassis +-500V DC (according to the manual). And it has a "digital" voltage display! Oltronix was a company that was based in Sweden that made high end laboratory equipment. Parts of the company still exist and are based in the Netherlands.  There is a similar three channel model B603D that has an additional 6V power supply.    I opened it an cleaned some dust, before powering it on. Take it apart (as Dave Jones says)! It didn't look too bad. So I then powered it up. The 0-30V channel worked fine. But the 0-60V channel did not. So I began some more detai...
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Helping hand that works

When soldering, you sometimes need a third hand keeping things in place. I got this idea from the eevblog forum ( https://www.eevblog.com/forum/reviews/a-3rd-hand-that-actually-works!/ ) and the excellent blog post here: https://www.engineerable.com/single-post/diy-the-best-helping-hands-for-electronics-soldering-pcb-work-jewelry The thing is, that cheap "helping hands" or "third hands" frankly sucks.  I'm thinking on the ones that look like this:   I've used these ones and the mechanism is limited and the crocodile clips are annoying and don't grip well. You can improve them slightly by adding some heat shrink tube on the teeth. I do use also other kind of tools, e.g. a regular vice: This is an excellent vice for the price. The model is  RÖHM 863421 , and it's perfect for small hobby projects including drilling and cutting.  I also have this holder for PCBs. It works OK:   Now I did have one of these magnetic holder stands for dial indicators. But ...
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