A Logic Probe Online
Most modern logic probes have a switch on the side marked TTL/CMOS . Flipping this switch changes the internal voltage thresholds. Always set this switch to match the chip you are testing, or your "High" might look like a "Low."
Most modern logic probes have a switch on the side marked TTL/CMOS . Flipping this switch changes the internal voltage thresholds. Always set this switch to match the chip you are testing, or your "High" might look like a "Low."