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The Perceptron Circuit
by Christopher McCarley

from the January 2006 issue.
20 I/O Pin Data Acquisition Board
by James Mobley

from the March 2006 issue.
Octal Logic Probe
by Jim Brannan

from the April 2006 issue.
Design Your Own Crystal Oscillator
by Paul Florian

from the August 2006 issue.
Simple Circuit Breaker
by Charles Irwin

from the October 2005 issue.
Universal Relay Board
by Michael Jeffery

from the April 2005 issue.
Theory of Zeroing Circuitry
by John Kocerek

from the December 2004 issue.
Nine Volt Function Generator
by Frank Reiser

from the September 2006 issue.
The Proto Buddy
by Jim Stewart

from the January 2009 issue.