Homebrew PCBs

Harvey,

I failed to mention that this particular project is not just part of my
hobby. Someone else is trying to make some money with it. So cost does
matter in this particular case.

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Harvey White
Sent: Friday, February 22, 2013 4:19 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] DIY pcb exposure box UV tl

On Fri, 22 Feb 2013 09:13:43 -0700, you wrote:

>Hari,
>
>I am fascinated with the ATTiny85 (computer system on a chip and cost 
>under
>$1) but refuse to take the leap until I can find a really cool application.
>Recently I thought I had one but then realized I could do the same 
>function with a 25 cent quad op amp and a few passive components. The 
>cost was half of the ATTiny :-(

Exposure timer.  Exposure timer (if it has an a/d) with sensitivity to
exposure.  

Do it because it's neat.  You're talking about a 50 cent difference (but not
really) in hardware cost, but you're talking versatility.

It's a hobby, do it because it can be fun.  That's what hobbies are for, to
allow you to spend the money without really having to justify it.... (just
the total expenditure).


Harvey


>
>Rick
>
>-----Original Message-----
>From: Homebrew_PCBs@yahoogroups.com 
>[mailto:Homebrew_PCBs@yahoogroups.com]
>On Behalf Of Hari Hendaryanto
>Sent: Friday, February 22, 2013 9:09 AM
>To: Homebrew_PCBs@yahoogroups.com
>Subject: Re: [Homebrew_PCBs] DIY pcb exposure box UV tl
>
>
>Hi rick,
>
>New url is okay. I'll check if it's(or equivalent)  available on my 
>local suplier
>
>Yes you were right about how people build things. It's just a matter of 
>personal taste.;)
>
>Reason why I'm using proc, because I already have it and not using for 
>anything.
>
>Thanks for your response
>Regards
>Hari
>



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