Fig. L: The complete reaction-timer circuit barely fits on
a 63-row breadboard.
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Want to learn the fundamentals of electronics
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» 30W adjustable soldering iron with stand,
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» Digital multimeter
» Wire strippers
» Deluxe wire cutters
» Three 25ft spools of solid-core 22AWG
» Deluxe needlenose pliers
» 5-piece miniature screwdriver kit
» Desolder pump
» PanaVise Jr. for holding circuits while you solder
» WeeBlinky Kit (requires soldering)
» Maker’s Notebook
» Make: Electronics book
FINISH X
;;;;;
;;;;;;
Start
Switch
;;;;;;
;;;;;
;;;;
555 in
Delay
Mode
;;;;;;;;;;;;
;;;;;;;;;;;;
End-of-Delay
Start Signal
;;;;
;;;;;;
Stop
Switch
;;;;;;
;;;;;;;;;
;;;;
555 in
Flip-Flop
Mode
;;;;;;
;;;
Prompt
LED
;;;;;;;
;;;;;;
;;
;;;;;;;
Counter
Enable
or
Disable
;;;;;;;
;;;;;;;
Numeric
Display
;;;;;
;;;;;;
Reset
Switch
;;;;;
;;;;;;;
Pulse
Counter
;;;
;;;;;
;;;;;;;;;
555
Pulse
Generator
Fig. M: The functions of the reflex tester, summarized as
a block diagram.
107 Make:
