Basic Logic – TheWorksheets.CoM – Page 2

Basic logic gate troubleshooting - ibiblio.org

Logic probes are useful tools for troubleshooting digital logic gate circuits, but they certainly have limitations. For instance, in this simple circuit, a logic probe will give correct ”high” and ”low” readings at test point 1 (TP1), but it will always read ”low” (even when the LED is on) at test point 2 (TP2): VDD TP1 TP2