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This is a circuit that will indicate the status of a 555 IC. LED indication.
AIYI 3 IN 1 VOLTAGE TEST LIGHT | AY001-388
AIYI 6VDC - 24VDC TEST LIGHT | AYI1043-031
DIGITAL PANEL LIGHT AC VOLTS - AMBER
EFK 4001 Continuity Tester
EFK 4002 Logic Probe
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