TTL homebrew CPUs

Allison ajp166 at
Tue Jul 10 05:48:59 CDT 2007

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


>            -Dave
>Dave McGuire
>Port Charlotte, FL

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