[sdiy] PCB / Panel Manufacture

[Shawn Rakestraw]

John Shea, the design began with Electronotes. I decided to build one of
the power supplies I found in the Preferred Circuits book. When I laid out
the circuit, I changed the regulators to the 7812 and 7912. I left the
capacitors as they were in the original schematic. Having a look at my
datasheets just now shows 330 nF on the input of both regulators and yes it
is probably redundant. The positive regulator had a .1 uF "minimum" on the
output (I will probably leave my .22 uF on there) and the negative shows a
1 uF on the output. None are electrolytic on the data sheets. I updated my
schematic and board so they are all the same now (like c5 and c6 on the
original. Not sure why Bernie drew his schematic with electrolytics on the
negative regulator.

- Shawn

On Sun, Feb 9, 2020 at 7:09 PM <rsdio at audiobanshee.com> wrote:

> It seems that a larger via removes more copper, so it should be better to
> simply use more vias, each with the smallest drill supported, for the most
> copper connecting layers.
>
> Has anyone seen a writeup on the advantage/disadvantages comparing more,
> smaller vias versus fewer, larger vias?
>
> Brian
>
>
> On Feb 8, 2020, at 7:29 AM, Vesa Lahteenmaki <vjhl2000 at hotmail.com> wrote:
> > very tiny via on track to the negative regulator,  I would use much
> larger via because of current flowing through.
>
>
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