How can i fix this proteus bug?

[sungmin Jang]

Hi bro! I have some problem in proteus plz help me

In First  i using 1hz circuit on the left in R7

when high(+5v)

when low(0v)

   

some times R5 and R6 blink at the same time..

how can I fix this??? have a good day! 

[gregebert]

I dont use proteus for simulations; strictly Verilog and SPICE. But I think I have an idea what the problem might be.

I suspect the simulator is getting confused about the series resistors. When I model resistors in verilog, I usually use rtran statements [OK, technically it's tranif1 because I need to have a way to enable/disable the resistor]. But that becomes a problem when 2 or more resistors are in-series. In that case, I will model one of my resistors as either a pulldown or a pullup and fortunately that seems to work most of the time when I have resistors involved in a digital-only section of the design, such as a voltage-divider or a pullup resistor for a DIPswitch. So the resistor-model for digital simulations is basically open (default), weak pulldown, weak pullup, or rtran.

Of course, when it comes to modeling in SPICE, nothing needs to be done because that's a purely analog simulator.

[sungmin Jang]

Thk bro! I fix it for your advice 

it's a good time to learn!
2019년 9월 13일 금요일 오전 6시 17분 25초 UTC+9, gregebert 님의 말: