I have to simulate this schematic in LTspice. The problem is, that it uses an CMOS 4017N counter. I've only found one libary which has that element, but it has different inputs. The main problem i have, is that i dont have the VDD input. On the first picture is my project, and on the second one is the schematic. If it is needed i can attach my project folder also in the comments.

 

My project files with the lib file

 

Hi alek,
Welcome to AAC.
The simulation runs OK, the VDD for the 4017 is set to 9V???
E

 

The main problem i have, is that i dont have the VDD input.

The Vdd power and ground connections to the CD4000 devices are hidden in LTspice to minimize clutter in the schematic .
The .inc CD4000_V.lib command makes those connections from your external Vdd voltage and circuit common to the CD4000 devices.
You don't have to change the voltage in the symbol parameters from its default 5V.

 

Thanks for the response, guys. My circuit should sequentially light up the LEDs 1-8 in a loop, while LED 9 should stay on all the time. So, in this case, is the circuit working correctly? The circuit is powered by a 9V LED, which is why there is 9V on the CMOS 4017 counter. This is my first time working with such a complicated circuit in LTspice, so I wasn't exactly sure what I was doing.

 

Hi,
Although the VDD of the 4017 is set to 9V, the loading caused by directly driving an LED without a series current limiting resistor will pull the output down to approx 4V.
E

 

Yeah i know but on the original schematic the series limiting resistor has a value of 0 Ohms, so i just didnt place it. If im even correct thats the one on the right?

 

Hi alek,
You should use a series resistor to limit the maximum output current as specified in the datasheet.
E

 

Hi

I've included a new symbol in zip.

When using the CD4000_v.lib library, the VDD=9 symbol attribute sets the internal timing delays
of the model and doesn't affect the operating voltage, but you want them both to match.
In addition, "VDD" must be present as wire label or errors will be produced.

The .param VDD=9 statement sets the circuit supply voltage as well as the timings for the CD4017B model.

 

Wow, thank you all guys very much for help i really appreciate that

 

Wow, thank you all guys very much for help i really appreciate that

Your simulations are not correct! A voltage greater than the breakdown voltage develops at the Base-Emitter junctions! LTspice allows you to simulate a breakdown. I've brought out the voltages on all the bases:

 

@alekwyp
Seems you didn’t place a C4 to your circuit.
It creates a change in speed of running the light according frequency of left multivibrator due to continuous charging/discharging the C4.