Hello! My parents gave me the Computer Logic Lab by NSI as a Christmas Present while I was growing up. I had fun learning a lot about electronics. Now it's time for me to pass it on the my son. A couple of things have bothered me through the years, and I'd like to try to complete my understanding:
- In the circuit diagram attached (similiar to others in the workbook), why do I need a 2.2K resistor is connected to the output of the the 7400 IC. There are some circuits that do not call for that resistor.
- Why does the attached circuit also need a 1K resistor attached to the input of the IC?
The circuit is powered by three 1.5 volt batteries in series, giving a total of 4.5 volts.
- In the circuit diagram attached (similiar to others in the workbook), why do I need a 2.2K resistor is connected to the output of the the 7400 IC. There are some circuits that do not call for that resistor.
- Why does the attached circuit also need a 1K resistor attached to the input of the IC?
The circuit is powered by three 1.5 volt batteries in series, giving a total of 4.5 volts.