You are troubleshooting a TTL circuit board containing dozens of IC chips. You have taken several readings at numerous IC chips but the readings are inconclusive because of their erratic nature. Assuming the circuit worked properly at one time, what is the most likely cause of the problem?
A) A solder bridge between the inputs on the first IC chip on the board
B) A defective output IC chip that has an internal open to Vcc
C) An open connection between the inputs on the first IC chip on the board
D) A defective IC chip that is drawing excessive current from the power supply
Question 2
A 74HC85 magnitude comparator is used to:
A) compare two input voltage levels and generate outputs to indicate which voltage has the greater magnitude.
B) Exclusive OR two binary quantities and generate an output if they are unequal in magnitude.
C) compare two input binary quantities and generate outputs to indicate which quantity has the greater magnitude.
D) AND two binary quantities and generate outputs only if they are equal in magnitude.
Cricket chips
Board games
Using a DMM to measure the open-circuit voltage of a battery.
A typical temperature sensor circuit.
Connecting cables and a computer to perform off-board programming.
The muscle-spindle feedback circuit