Fig. L: The complete reaction-timer circuit barely fits on a 63-row breadboard.
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6WDUW Start 6ZLWFK Switch
555 in LQ 'HOD\ Delay 0RGH Mode
(QG RI 'HOD\ End-of-Delay 6WDUW 6LJQDO Start Signal
6WRS Stop 6ZLWFK Switch
555 in LQ Flip-Flop )OLS )ORS 0RGH Mode
3URPSW Prompt /(' LED
Counter &RXQWHU Enable (QDEOH or RU 'LVDEOH Disable
1XPHULF Numeric 'LVSOD\ Display
Reset 5HVHW 6ZLWFK Switch
3XOVH Pulse &RXQWHU Counter
555 Pulse SXOVH Generator JHQHUDWRU
Fig. M: The functions of the reflex tester, summarized as a block diagram.
FINISH X Make:
107