A logic probe is a handheld pen-like probe used for analysing and troubleshooting the logical states ‘0’ or ‘1’ of a digital circuit. While most logic probes are powered by the circuit under test, some probes use batteries. These can be used for either TTL (transistor-transistor logic) or CMOS (complementary metallic oxide semiconductor) integrated circuit … Continue reading TRANSISTORISED LOGIC PROBE FOR TTL