Simple Logic Probe by NE556
Thursday, March 12th, 2009This circuit effectively functions as a logic-level indicator or logic probe for TTL circuits. It gives an indication of any of the following four conditions that might be found on a typical digital circuit and thus provides a versatile troubleshooting aid: 1. Line high (logic 1) 2. Line low (logic 0) 3. Line tri-state (high [...]
