Ttl logic tester

  
Gates Gl and G2 together with resistors Rl and R2 form a simple voltage monitor that has a trip point of 1 volts. Gate G3 is simply an inverter. The display section of the tester consists of a common anode alphanumeric LED and current-limiting resistors
Ttl logic tester - schematic

It indicates whether the input voltage is above or below 1,4 V, and displays a H or a L (for high or low logic-level) respectively.




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