Uni-Byte 0220 - SUPER Versatile and CONFIGURABLE Linear Power Supply: Part 2

[@uni-byte]

The project is now in my uploaded projects at PCBWay. The link is in the description.

[@t1d100]

Tip: Your use of multiple pin hole distances, on the big caps, is a clever idea to add versatility in choosing the caps' diameters/values. Bravo! Once, I created a big e-cap footprint that was one pin hole and a slot, for the other pin hole. Thereby, there was absolutely no limitation on the choice of cap pin distances. I also created a footprint that is a pair of 1mm pin holes, spaced 5mm on center, with the two pads of a 1206 SMD nested in between the holes. This allows the use of one, or the other, of a 5mm TH, or a 1206 SMD, or both to make a parallel pair... say a 5mm ceramic cap and a 1206 resistor, to make a filter... All in the space of a single 5mm component. I use a great many components that come in both 5mm TH and 1206 SMD... LEDs, ceramic caps, resistors, diodes, on and on. So, I use this combo footprint a great deal of the time. Admittedly, the 5mm THs have to be set on the vertical, sometimes. But, that is rarely a problem and often a preference. HTH.

[@uni-byte]

I like the slot idea. Very nice!

[@CR_0514]

Nice looking board! Very useful for powering small projects. Good video as always.

[@uni-byte]

Glad you like it!

[@t1d100]

I really liked the way you considered each stage of development... Just rectified, then smoothed, then regulated. I found that to be very visually informative = great teaching. I am working on the supply for a project. That crept into including revising my own wall adapter boards. I remembered to review the first video of this series and found this second edition. Now, I am off to find the first. I want to be sure to include your great tips on my revision. Thanks, so much!

[@uni-byte]

Glad it was of assistance.

[@Mr.Leeroy]

C = I / (dV x F) so for 250mV ripple at 1amp C = 1A / (0.25 x 2x50Hz) = 40'000 uF Pretty handy formula to stay realistic before going through too much hassle for nothing.

[@johnwest7993]

I think I would have done LM317 bds with hole patterns for either trim pots or resistor dividers to set the voltage. Of course, I have a bag of about 50 LM317's I pulled from scrap bds a few years ago. But I'm finding that I need odd, typically quite low voltages more and more often for microcontroller and sensor circuits. Between 1V and 3.3V as often as not. Not much interesting stuff is running at 5V or higher any more.

[@andye2005]

About 40 odd years ago where I first worked LM317's were pretty new, and we used loads of them. For custom test equipment we had a small board made up very much like this one, Ten turn pots for adjustment, we never bothered with fixed resistors. But one thing we did slightly different was to fit the regulator on one edge of the board and used a simple L shaped bracket as a heat sink. This also served as an easy way to fit the board into the equipment, and if necessary it could be bolted to the back panel or a larger heatsink if required. Andy

[@uni-byte]

I had thought about using LM317s but looked at the several hundred LM78XX series regulators I got from surplus store and decided to keep it as simple as possible. So, kind of driven from the same perspective as you.

[@uni-byte]

All good ideas!

[@mikepanchaud1]

Don't forget you need a heat sink for any appreciable current.

[@uni-byte]

Not forgotten, thanks!

[@RoyBellingan]

I would like to do something something like that myself but adding a capacity multiplayer stage before the stabilizer

[@uni-byte]

Go for it!

[@cougar1861]

Do you plan to add these boards to your projects already unloaded to PCBWay?

[@uni-byte]

Sure, I can do that. I'm making some minor mods to the board to allow for direct wiring and bigger capacitors. As soon as I have that completed I will upload. Give me a few days then check there.

[@cougar1861]

@@uni-byte Great, thanks.

[@uni-byte]

@@cougar1861 It's uploaded.

[@cougar1861]

@@uni-byte Thanks again!