Homebrew PCBs

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
>