TTL homebrew CPUs

Dave McGuire mcguire at
Mon Jul 9 17:45:52 CDT 2007

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.


Dave McGuire
Port Charlotte, FL

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