Which schematic is easier to see?

First of all, I have created two circuit diagrams for amplifiers using two operational amplifiers.
Which circuit diagram is easier to read?

Both have the same function, but the wiring in Figure 1 is straightforward.

On the other hand, in Fig. 2, wiring was performed using Label Net.

In Figure 1, there are places where the power supply wiring and the signal wiring intersect.
On the other hand, Fig. 2 uses Label Net, so there are no wiring intersections.

For this reason, I think Figure 2 is easier to see.

How to use LabelNet

Select Label Net from the menu bar as shown in Fig. 3, give it an arbitrary name, and assign it to the wire (node). By assigning the same label name to the wiring, even if the wiring is far away, it is considered to be connected.

Therefore, using Label Net to separate the power supply and signal system makes it possible to draw an easy-to-read circuit diagram.

Name the measurement points with Label Net

Let's run a simulation of the two types of op-amp circuits we created.
The measurement points are the signal source V1 and the output terminal of the operational amplifier (U2).

Looking at the waveform results, in Figure 4-2, we have assigned the arbitrary names "V_IN" and "V_OUT" to the wiring using Label Net, so it is easy to see which terminal the waveform result is for.

Figure 4-1 shows the node names n006 and n003 inside SPICE. Even if you look at the name of the waveform, it will be difficult to know which pin it is.

Therefore, it is recommended to use "Label Net" for the measurement point and give it an arbitrary name.

LTspice demo file verified this time

On a computer with LTspice installed, extract the zip file to the same folder, then run LTspice and the waveform display will begin automatically.

Label_opamp__1.zip

The amplifier circuit of the operational amplifier used this time

How do I change the colors of circuit symbols and wires?

As you may have noticed, the symbols and wiring colors in the circuit diagrams in this article have been changed from the default colors (black for symbols, blue for wiring). Why not try customizing the colors within LTspice and using your own original color scheme?

You can change the color scheme in LTspice from the Settings menu in the upper left corner of the toolbar. For details, please refer to the Settings explanation in the Help section. We have created supplementary materials in easy-to-understand Japanese. You can download them after completing the survey below. After completing the survey, wewill send youan email with a URL to download the supplementary materials.

If you have any requests, such as what kind of seminar you would like us to hold or what kind of technical materials you would like us to provide, please let us know in the free-response section of the survey. Based on your feedback, we would like to hold seminars and provide technical materials that will be helpful to you.

At the end

This time, we introduced how to create circuit diagrams using "Label Net" and check simulation waveform data.

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