[sdiy] 5V power supply for logic and uC

[Thomas Strathmann]

On 02.11.12 18:58, Barry Klein wrote:
> There probably is not much reason to be too focused here - perhaps mainly worry about microcontroller things with HF clocks.  The goal is to put capacitance as close as possible to the IC pins drawing the current and keep the ground path short (cap to IC) as well.  Here's a good article I just came across:
> http://www.intersil.com/content/dam/Intersil/documents/an13/an1325.pdf
> 
> .1uf ceramics are very common in SMT boards.  The ferrite beads may be a good idea if you are worried about RF emissions - but most hobbyists aren't.  They are also good to keep rf out of analog circuits.  These too are typically SMT.  They do have ferrite donut cores you could put on resistor/wire leads for through-hole things.
> There is some debate about the cap bypassing - a HP paper recommends 3 values in parallel (see article).  I wouldn't worry about it - just look at the reference designs of any "special" chips you are using and see if they have such caps.  That usually is your minimum starting point.
> With digital IC's put in the caps but try and find some good books on pcb layout to be sure you are following guidelines there.

Awesome, thank you. That's mostly what I thought I should do (i.e. not
worry about noise too much unless hight clock frequencies or
non-standard parts/designs are involved; and use common sense with
regard to bypass caps). I have read about issues in PCB design (mostly
in Tim Williams' Circuit Designer'S Companion), but as I use stripboard
for my circuits I can only use some of the general ideas behind what
seem to be good layout practises. Anyway, I will have a good look at the
article you mentioned, looks really useful.

	Thomas