TTL homebrew CPUs - test-drb@ccmp.vtda.org

10 Jul 2007

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Subject: Re: TTL homebrew CPUs
   From: Dave McGuire <mcguire at neurotica.com>
   Date: Mon, 09 Jul 2007 18:45:52 -0400
     To: "General Discussion: On-Topic Posts Only" <cctech at
classiccmp.org>

On Jul 9, 2007, at 5:51 PM, Tony Duell wrote:
   recycled
industry application notes), that required some special  
 circuit
 only available at their or associated stores. Having seen the nth PIC
 application that basically blinks a LED - what my generation built  
 with
 2 transistors, 2 capacitors, 4 resistors - is lame. 
 You're making me feel very old. When I was a kid, I used to make a  
 neon
 bulb blink using one resistor and one capacitor. 
   Relaxation oscillators are fun.  I like the UJT version as well,  
though UJTs are getting harder to find than they once were.  I have  
two or three 2N2646 UJTs left. 
Yes but you can build your own UJT using a 2n3904 and 3906 plus two resistors.

Allison

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            -Dave

-- 
Dave McGuire
Port Charlotte, FL