Electronics > Projects, Designs, and Technical Stuff
I see Two Circuits/What circuit is best? (linear bench PS and know how)
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001:

--- Quote from: bd139 on November 11, 2018, 02:24:04 pm ---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/

--- End quote ---

Thanx!
Why You prefer "A" instead "B"?
How looks Your clone (for mechanical and thermo reasons)?
bd139:
There is no E3620B (yet)

I haven’t cloned it myself but that’s where I would start. It would take a lot of experimentation to get it built though and would likely cost more than buying one anyway.

If faced with the task I would probably buy a mastech and some big Zener diodes and a bunch of fuses to protect my circuit from the power supply  :-DD
rstofer:
Is that multi-winding transformer used in the HP design actually available?  I can't read the parts list in the .pdf (oddball viewer, I guess) so I can't see a part number.

It would seem to me to be just as difficult to get that transformer into Antarctica as an entire power supply.  I suppose an alternative would be multiple transformers.

One question re: the first design: Could I realistically recreate the PCB?  For me, the answer is no.  I have neither the time nor the patience to take on such a project.
001:

--- Quote from: rstofer on November 11, 2018, 04:23:49 pm ---One question re: the first design: Could I realistically recreate the PCB?  For me, the answer is no.  I have neither the time nor the patience to take on such a project.

--- End quote ---

It is simplest and lazy part of work  ;)
not1xor1:

--- Quote from: bd139 on November 11, 2018, 02:24:04 pm ---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/

--- End quote ---

IMHO the triac preregulator is an overkill for such a limited amount of power.
A two winding transformer with a mosfet as a switch would have been more than enough.

A couple of months ago I tested (just in the LTSPICE virtual world, where burnt silicon doesn't smell  >:D) a similar design with MOSFET switches rather than triacs.

The main problem is that it is hard to find a 3 winding transformer.
I wonder how difficult it would be to unwind the secondary of a toroidal transformer and then rewind it in 3 separate parts .
Large transformers are probably more manageable as they have a larger hole and require less turns per volt.
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