Electronics > Beginners

lab power supply

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not1xor1:

--- Quote from: David Hess on December 15, 2019, 02:29:28 am ---Below is the lab power supply schematic that I would emulate from National Semiconductor linear brief 28.  Instead of using expensive LM395 integrated power transistors, the power pass element could be replaced with suitable integrated regulators or bare transistors or some combination of the two.

--- End quote ---

that's a nice circuit (unlike the other ones >:D) but it looks like LM308 is no longer available and LM101 is hard to find and very expensive, although there are cheap LM301 in sot8 package from onsemi.

replacing those opamps with modern parts would require a different compensation network and careful selection of parts complying with the same input range (and other features) of the original ones or mirroring the design (regarding polarity) to rather use the so-called single power supply opamps that usually include the negative rail as input range.

glinjik:
sorry misunderstood i am limiting the current but what i meant was i dont need high amps, i want a range between ma and 1 amp. as i understand it if i dont limit the current then if i put a big load on then it will just suck the amps untill the transformer gets hot and i get my own global meltdown unless im wrong (high probability) :-DD

glinjik:
can someone advise please which of these caps is best for this part the electrolitic i have its the non polarised ones im strugling with

glinjik:
some reason this capture didnt upload in last post

glinjik:
ref post 20 the blue ones are not caps they are resistors at 0.67 \$\Omega\$ oops

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