TTL Pulse Reading Logic Probe

This circuit uses LEDs to display logic states for high, low, rising pulse, and falling pulse, it is generally useful for debugging logic circuitry.This circuit can monitor TTL logic levels. TTL compatible CMOS logic families can also be monitored.This circuit can be built on perforated circuit board and wired by hand. The completed circuit can be assembled into a clear plastic box with the wires protruding out one end. The LEDs should be visible through the box. IC sockets should be used for easy chip replacement.

TTL Pulse Reading Logic Probe at www.circuitsarchive.org