Help turning a Falstad LM324 voltage monitor into a 40 × 100 mm PCB layout

Thread Starter

yusufkln31

Joined May 4, 2026
1
Hello, I need help with a school project.

I have a working Falstad simulation and I would like to turn it into a PCB layout, preferably in KiCad.

The circuit is a voltage monitor using an LM324 and three LEDs.

Required behavior:

  • at 10.7 V only the yellow LED should turn on
  • at 12 V only the green LED should turn on
  • at 14.5 V only the red LED should turn on
  • only one LED should be on at a time
Parts used in the Falstad simulation:

  • LM324, using 3 of the 4 op-amps
  • 3 LEDs with 560 ohm series resistors
  • 4.7 V Zener diode
  • 2 × 1N4148 diodes
  • several resistors as voltage dividers
  • input selection for 10.7 V / 12 V / 14.5 V
I can provide screenshots of the Falstad simulation and my current KiCad schematic/layout.

My PCB requirements:

  • single-sided PCB
  • board size: 40 × 100 mm
  • LM324 as DIP-14
  • all components from the Falstad simulation should be on the PCB, except the voltmeter
  • the 3 LEDs should be on the PCB
  • 3 input pads for 10.7 V / 12 V / 14.5 V
  • 4.7 V Zener diode and the two 1N4148 diodes should be included
  • I want to avoid crossing tracks as much as possible
  • wire jumpers are okay if needed
  • I would like to avoid 90-degree track corners
Can someone help me check the schematic and suggest a clean component placement / PCB layout?
 

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crutschow

Joined Mar 14, 2008
38,349
Can someone help me check the schematic and suggest a clean component placement / PCB layout?
So you want us to do a PCB layout for you?

Sorry, this is Homework Help, not Homework Do.
You can do a layout and then we will critique if for you, but that's the limit of our help.
Post a picture of your layout.
 
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