Electronics > Projects, Designs, and Technical Stuff
My first power supply
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ocset:
almost any diode that is rated to at least VIN would be ok to replace that 1N5395.
...yes rl207 is fine
https://www.rectron.com/data_sheets/rl201-rl207.pdf
MarkF:
You can use anything in the 1N539x series.  1.5A diodes with 50V to 1000V rating. 
   For example https://www.mouser.com/ProductDetail/Vishay-Semiconductors/1N5393-E3-54?qs=sGAEpiMZZMtbRapU8LlZD0HbIjlpuZ44OLW52lnUrFQ%3D

You can use diodes from the 1n400x series.  But, they are only rated at 1A.  The MC78xx and MC79xx regulators are also only rated for 1A.  Your choice.  I just would not push the maximum for the diodes or the regulators.

You can also use a bridge instead of individual diodes.  I needed to buy diodes so I used the same value for all of them.


1N539x datasheet:   https://www.vishay.com/docs/88514/1n5391.pdf
james_s:

--- Quote from: OM222O on April 26, 2019, 02:09:31 am ---I can't be sure but it seems like you have 2 LDOs in parallel  ???
One will back feed the other due to voltages not being exactly the same which is bad
also did you consider a basic voltage adjustment pot? most LDOs are adjustable via a voltage divider circuit which you can make from 1 fixed resistor and 1 pot to allow crude adjustability of the voltage.

--- End quote ---

When I was about 12 I built a power supply with 3 7812 regulators in parallel, it may not be advisable to do but it did work and I used it regularly for about 20 years before I finally rebuilt it with a switchmode regulator. Ironically that blew up within a year.

So the point is, I wouldn't do something like that in a commercial product but sometimes you can get away with things.
MarkF:
If you are just adding the protection diodes to your old project, use the 1N400x diodes you already have.
queennikki1972:
Yes MarkF, its a small transformer and fairly low current I was thinking that too about using the 1n4000 series for the small power supply, but I did order some 1.5amp diodes today so I'll have them. I am taking notes on everything you guys have suggested. I have no need for the variable pots on this project as I have other power supplies on hand. And I read up on why you have a third binding post for earth ground and that chassis ground (ac ground )should not be same as - negative binding post by default. i hope I said that right.

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