---
product_id: 34610185
title: "LJ12A3-4-Z/BY Proximity Switch DC 10-30V PNP NO 3-Wire 300MA 4mm Cylindrical Inductive Sensor Approach Positive Voltage Regulator L7805CV for 3D Printer Ramps"
brand: "diymall"
price: "€ 0.97"
currency: EUR
in_stock: false
reviews_count: 8
url: https://www.desertcart.hr/products/34610185-lj12a3-4-z-by-proximity-switch-dc-10-30v-pnp
store_origin: HR
region: Croatia
---

# LJ12A3-4-Z/BY Proximity Switch DC 10-30V PNP NO 3-Wire 300MA 4mm Cylindrical Inductive Sensor Approach Positive Voltage Regulator L7805CV for 3D Printer Ramps

**Brand:** diymall
**Price:** € 0.97
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** LJ12A3-4-Z/BY Proximity Switch DC 10-30V PNP NO 3-Wire 300MA 4mm Cylindrical Inductive Sensor Approach Positive Voltage Regulator L7805CV for 3D Printer Ramps by diymall
- **How much does it cost?** € 0.97 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/34610185-lj12a3-4-z-by-proximity-switch-dc-10-30v-pnp)

## Best For

- diymall enthusiasts

## Why This Product

- Trusted diymall brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description



## Images

![LJ12A3-4-Z/BY Proximity Switch DC 10-30V PNP NO 3-Wire 300MA 4mm Cylindrical Inductive Sensor Approach Positive Voltage Regulator L7805CV for 3D Printer Ramps - Image 1](https://m.media-amazon.com/images/I/61PxPfQlP2L.jpg)
![LJ12A3-4-Z/BY Proximity Switch DC 10-30V PNP NO 3-Wire 300MA 4mm Cylindrical Inductive Sensor Approach Positive Voltage Regulator L7805CV for 3D Printer Ramps - Image 2](https://m.media-amazon.com/images/I/51593NlLTCL.jpg)
![LJ12A3-4-Z/BY Proximity Switch DC 10-30V PNP NO 3-Wire 300MA 4mm Cylindrical Inductive Sensor Approach Positive Voltage Regulator L7805CV for 3D Printer Ramps - Image 3](https://m.media-amazon.com/images/I/61PniPRw1SL.jpg)
![LJ12A3-4-Z/BY Proximity Switch DC 10-30V PNP NO 3-Wire 300MA 4mm Cylindrical Inductive Sensor Approach Positive Voltage Regulator L7805CV for 3D Printer Ramps - Image 4](https://m.media-amazon.com/images/I/51p1Xz-jy8L.jpg)
![LJ12A3-4-Z/BY Proximity Switch DC 10-30V PNP NO 3-Wire 300MA 4mm Cylindrical Inductive Sensor Approach Positive Voltage Regulator L7805CV for 3D Printer Ramps - Image 5](https://m.media-amazon.com/images/I/51dgqEzF8CL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Works great.
  

*by M***. on Reviewed in the United States on September 24, 2017*

Received this very quickly, and did some minor testing, had issues at first, but it was with my setup and not hte sensor.I have since set it properly, and works like a charm.  I would recommend not using the included voltage reg, and instead use a voltage divider setup with a pair of 10k, and 15k resistors.  Check out Tom's review on youtube, search auto bed leveling on youtube, or instructables to see how to set up resistors.

### ⭐ 1.0 out of 5 stars







  
  
    The sensor can't power the voltage regulator.
  

*by T***N on Reviewed in the United States on April 7, 2017*

This sensor with the LM7805 does not work reliably.  Sometimes your A-net V1.0 board will not detect the switch "closing", and your nozzle will be driven into your heatbed.  Sometimes it doesn't "open", which causes Skynet to get a false positive when it makes it's second probe, and you get spaghetti printed in the air.This bogus combo is supposed to use the 12V output from the sensor to power a 5V V-reg.  Unfortunately, the output of the sensor goes through a 10K Ohm resistor, which provides nowhere near enough current to the regulator input.  Also, the regulator is not designed to pull the output down to ground when "off".  You will never get 5V or 0V reliably from this setup.

### ⭐⭐ 2.0 out of 5 stars







  
  
    Not always accurate
  

*by K***E on Reviewed in the United States on October 26, 2017*

Bought this for an Anet A8. Took a bit of work to figure out the wiring, and needed to flip a bit in the firmware but got it working.The major problem is that it doesn't seem to be consistent on it's measurements. When the unit auto levels it seems to randomly not detect the bed which results in the hotend taking a nose dive into my PEI sheet. Basically means I have to watch the printer like a hawk every time I bed level.I am looking to replace this, and would not recommend getting it.

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**Shop now:** [https://www.desertcart.hr/products/34610185-lj12a3-4-z-by-proximity-switch-dc-10-30v-pnp](https://www.desertcart.hr/products/34610185-lj12a3-4-z-by-proximity-switch-dc-10-30v-pnp)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-02-08*