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The following instructions will allow you to build a practical test tool for troubleshooting and analyzing digital and microcontroller circuits. The c...
Here's the components needed to build the Logic Probe shown in the Bill of Materials (BOM) picture.
Here's the circuit schematic diagram for the Logic Probe.
Add the 1K and 330/470 ohm resistors onto the pcb and solder.
Place the (2) 150nf (0.15uF) capacitors onto the pcb and solder.
Add a 5V Voltage Regulator IC, (2) 14 Pin DIP sockets, the Hex Inverter IC and the 7 Segment LED display components onto the pcb and solder them.
Snap a 9V Battery to the battery clip. The Letter L should be displayed on the 7 Segment LED Display. Next soldered a red wire on the pcb where "Probe...
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