| Electronics > Projects, Designs, and Technical Stuff |
| I see Two Circuits/What circuit is best? (linear bench PS and know how) |
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| bd139:
There’s a tiny bit of noise on the switching of the preregulators but it’s a design compromise to keep it in the form factor. If it didn’t have this it’d have to be twice as large or twice as hot. The E3630 doesn’t really even get warm flat out. Relays fail which is a big problem really. Stability is 100% fine - HP put a lot of design thought into compensation, transient response and power up transients. A trick you can do with a shitty power supply is get a couple of 500m rolls of wire (aka huge low Q inductors) and stick a big cap on the end and try and charge it up. A couple of the cheaper brands (I’ve seen this on an HY1803D) will oscillate slowly at the power supply terminals. I haven’t made one blow up yet doing this but it’s fun to watch. Personally I use TTi PL series power supplies but the HP ones are an excellent and reliable design that is fit for analysis. |
| 001:
--- Quote from: bd139 on November 11, 2018, 10:43:58 am --- A trick you can do with a shitty power supply is get a couple of 500m rolls of wire (aka huge low Q inductors) and stick a big cap on the end and try and charge it up. A couple of the cheaper brands (I’ve seen this on an HY1803D) will oscillate slowly at the power supply terminals. I haven’t made one blow up yet doing this but it’s fun to watch. --- End quote --- wow :wtf: but why HY1803D so popular? what the way to modify it? |
| bd139:
I wouldn’t buy one or modify it. Better spend money on a second hand Hp/TTi/Agilent supply. |
| 001:
--- Quote from: bd139 on November 11, 2018, 12:41:18 pm ---I wouldn’t buy one or modify it. Better spend money on a second hand Hp/TTi/Agilent supply. --- End quote --- It is not easy if You far from US/Europe In fact all of linear supplies looks similar The same opamps transformer and power transistor So it looks not difficult to buid one for fun But what schematic is best for DIY clone? :-// |
| bd139:
Fair point. I’d clone an E3620A myself. Schematic here: https://www.eevblog.com/forum/testgear/agilent-e3620a-power-supply-no-schematic-available-says-agilent-support/ |
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