CMOS Logic Probem from Electronics - The Maplin Magazine: No. 46 October 1991 with 7-segment LED Display.






Diagnoses H (High), L (Low), F (Floating), and P (Pulsing). Using IC1 a dual comparator: CA3240, IC2 & IC4: CMOS 4001 Quad-NOR Gate, IC3: CMOS 4011 Quad-NAND Gate, plus TR1: BC107, and TR2-4: BC557 LED driving transistors. Pages 32-46 includes circuit pictures, block diagram, circuit diagram, Upper and Lower PCB legends and tracks, mechanical assembly diagrams, and component list.

7-segment Logic Probe Case Logic Probe Tip Tip Assembly Instructions
7-segment Logic Probe Case Logic Probe Tip Tip Assembly Instructions

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