When I run the simulation, LEDs are not working. I don't understand the errors.
How can I fix it?
Errors:
Circuit:
Electrical – Proteus 8 Simulation Errors. Loaded Netlist
proteus
Related Solutions
It seems to be a bug in Proteus. When creating very large circuits using hundred of logic gates, memories and flip-flop Proteus starts doing very weird things.
I had exactly the same problem.
Normally, Proteus triggers (energizes) both transistors at "exactly" the same time when the simulation starts. This type of initiation leaves the simulated circuit in a certain "equal" situation. For an A-stable circuit, it is always assumed that the circuit starts with one transistor in the "off" state and the other in the "on" state.
To do this simply add a "switch" to one part of your design. This will be left on the "off" state before you start your simulation. Then turn the switch "on". Everything will go as expected.
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Best Answer
This is because you are using a logic toggle part. This cannot provide any current in the simulation, it is literally a logic level.
If you go to the debugging tools section on the parts list (where you got the logic toggle part from) you can also select a logic level indicator, which will go to a 1 or a 0 depending on logic level.
For an LED to work, you would need to set it up as a real circuit, with a voltage input, switches and resistors.
The logic toggle and logic indicator parts are to be used to check that logic levels are only supposed to be used to verify a logic circuit is doing what it should be. Once it is, you would have to turn it into a real circuit to get LEDs lit.