hkBattousai
Advanced Member level 4
**broken link removed**
Q1) Are these true? :
a) In the circuit part (1), the the input resistor (R7) and capacitor (C1) act as a low pass filter, bacause any high frequency input (like noise) can output illegible readings on the displays.
b) We choose high resistor and low capacitor values, bacause we desire a high impedance at the input.
Q2) In the circuit part (2), is it a proper way to connect outputs of logic gates together? Even though they are in the same IC package, isn't there a probability that things go wrong in practice, like shortening the circuit life? If so, can you propose a better way?
Added after 25 minutes:
After a little google search and checking some sample circuits, I found that 7660 IC can be used for producing -5V and it looks like to be a simpler method than the one in this circuit.
Q1) Are these true? :
a) In the circuit part (1), the the input resistor (R7) and capacitor (C1) act as a low pass filter, bacause any high frequency input (like noise) can output illegible readings on the displays.
b) We choose high resistor and low capacitor values, bacause we desire a high impedance at the input.
Q2) In the circuit part (2), is it a proper way to connect outputs of logic gates together? Even though they are in the same IC package, isn't there a probability that things go wrong in practice, like shortening the circuit life? If so, can you propose a better way?
Added after 25 minutes:
After a little google search and checking some sample circuits, I found that 7660 IC can be used for producing -5V and it looks like to be a simpler method than the one in this circuit.
