All Questions
4
questions
1
vote
3
answers
117
views
Simple TTL: Is there a way to "detect" a high-z state and easily use that to drive other logic?
I have two TTL style logic chips, call them A and B (*), where the outputs of A are the inputs to B (think: 8 data lines). A has tri-state outputs, so when they are turned off they float. B is an ...
- 2,151
3
votes
1
answer
910
views
Why does the 74LS08 see an input logic level even if the inputs are not connected?
I have an 74LS08 (AND gate.) I did not connect any inputs to the IC, but it gives me voltage at the outputs. Should I separate VSS?
0
votes
1
answer
314
views
Frequency counter schematic
I was wondering what's wrong with my Proteus schematic.
This schematic is supposed to show the frequency in Hertz on the display but instead only three zeroes are displayed.
Is there any component ...
- 3
3
votes
1
answer
1k
views
NAND gate output doesn't change to logic 0 when expected
I have this circuit:
I'm powering it from an Arduino but that's inconsequential to the operation, it's simply a convenient source of +5v. The orange line is +, black to gnd.
If it's not clear from ...
- 31