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From: "John Jardine"
Subject: Re: Prototyping 101
Date: Mon, 23 Dec 2002 15:02:20 -0000
NNTP-Posting-Date: 23 Dec 2002 14:49:15 GMT
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Joe McElvenney wrote in message
> I have just been asked what are the preferred
> prototyping methods and physical forms used between the
> schematic, either on paper or a computer screen, and a
> working though not-quite-finished product?
> As I've never been employed as a design engineer (spent
> my years in support of military/police communications), I
> cannot give a very good answer to this question, though at
> one time or another I've used everything from squared paper
> to 'rats-nest' or SPICE/schematic-capture direct to PCB
> layout and have suffered the usual "slings and arrows of
> outrageous fortune" along the way.
> So what for you is the normal process (if such a thing
> exists) of morphing between concept and flashing lights?
> Cheers - Joe
1) Stare into space for 30 minutes.
2) Draw ideas on feint blue-grey squared pad using blue black pen.
3) Iterate using about a dozen sheets.
4) Get calculator out and discover (yet again) I can't break the laws of
5) Goto 1 until the circuitry and calcs look sweet.
6) If novel enough, I will put into Spice
7) Plug circuitry into matrix board and make it work.
(If it works on prototype board it'll work anywhere.)
8) Draw an exact circuit diagram (on paper, by hand).
9) Give it to a good PCB man.
Mindst ... this is only for analogue kit. For the digital stuff, I just draw
a diagram out and give it to the PCB man. (cos digital is easy!).
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