The MESR-100 ESR Meter is a compact diagnostic tool used to measure the equivalent series resistance (ESR) of capacitors. It helps technicians and hobbyists quickly identify weak or faulty capacitors during electronics troubleshooting.
MESR-100 ESR Meter Overview.
What Is an ESR Meter?
An ESR meter measures the internal resistance of a capacitor.High ESR readings often indicate capacitor degradation and can signal that replacement is needed.
Unboxing the MESR-100 ESR Meter
Package Contents.
The MESR-100 package includes the ESR meter unit, test probes, and user manual. Everything needed for basic operation is included for immediate setup.
Battery Installation and Setup
Installing Batteries.
Install the batteries into the meter and reattach the battery cover.
Powering ON.
Once powered on, the device is ready for use.
Zero Calibration Before Testing
Zero Calibration Process.
Before measuring any capacitor, the meter should be zero-calibrated by shorting the probes together and pressing the zero button. This removes probe resistance for more accurate readings.
Testing 50V 680µF Capacitor
First Capacitor Test.
A 50V 680µF electrolytic capacitor is tested first. Its ESR value is measured against the ESR reference table.
Testing 35V 1000µF Capacitor
Second Capacitor Test.
A 35V 1000µF capacitor is then tested. Its ESR reading is compared with the expected range.
Testing 10V 1000µF Capacitor
Final Capacitor Test.
The final test is performed on a 10V 1000µF electrolytic capacitor. The ESR value is checked against the reference chart.
Comparing ESR Readings with Reference Table
ESR Table Comparison.
Each measured ESR value can be compared with the reference table. This helps determine whether the capacitor remains in good condition or requires replacement.
The MESR-100 ESR Meter is a practical and affordable tool for capacitor diagnostics and electronics repair. Its compact design and fast testing capability make it a valuable addition to any technician’s toolbox.
A laminating machine like the OR-330 is a simple but essential tool for office and home use. However, one common issue users face is paper getting stuck inside the roller, often caused by overheating or improper feeding.
The good news?
You don’t need to replace the machine — you can fix it yourself with basic tools.
⚠️ Common Problem – Laminating Film Stuck & Overheating
When the laminator overheats, the plastic film can melt and stick to the internal heating element or rollers.
Signs of this issue:
Laminating pouch stuck halfway
Burning smell
Machine not pulling paper
Wrinkled or melted laminate output
🔌 Safety First – Always Power Off
Before opening the machine:
Unplug the laminator
Let it cool down completely
Work on a clean, flat surface
⚠️ Never open while hot — heating elements can cause burns.
🔩 Step 1: Disassemble the Laminator (Bottom Side)
Flip the machine upside down.
Removing the 4 screws from the base of the laminator.
Steps:
Remove the 4 screws at the base corners
Keep screws safely aside
This opens access to the internal structure.
🔩 Step 2: Open the Top Cover
Turn the machine back upright.
Steps:
Remove 2 screws near the indicator/control panel
Remove indicator/control panel.
Slowly lift the top cover
Carefully removing the top cover of the laminator.
👉 Be gentle — avoid damaging wires or clips.
🔥 Step 3: Access the Heating Element
Now you’ll see the heating section.
Steps:
Remove 2 screws on the heating element cover and take the cover off.
Unscrew the heating element cover carefully to access internal components.
Carefully remove the heating element
Slowly take out the heating element, ensuring no wires or components are strained.
🧩 Step 4: Identify the Problem Area & Remove the Stuck Laminating Film
At this stage, the issue becomes clear.
Stuck laminate blocking the roller and heating area.
What you’ll see:
Laminating film stuck between roller and bottom cover
Melted plastic residue
This blockage prevents smooth operation.
Steps:
Remove 2 screws from bottom heating cover and take off the cover
Gently pull out the stuck laminate
Removing the jammed laminate.
👉 Do not force it — avoid damaging rollers.
🧼 Step 6: Clean Melted Plastic Residue
Overheating often leaves sticky black plastic on the heating element.
Cleaning melted plastic residue from the heating element.
How to clean:
Use a knife or scraper carefully
Remove melted plastic slowly
Wipe with cloth if needed
⚠️ Be gentle to avoid scratching the heating surface.
🔄 Step 7: Reassemble the Machine
Now put everything back together.
Reassembling the laminator in reverse order.
Follow reverse order:
Install bottom heating cover
Reinstall heating element
Attach top heating cover
Close top casing
Secure 2 screws on top
Flip and tighten 4 bottom screws
✅ Step 8: Test the Laminator
Time to check your repair.
Laminator working smoothly after repair.
Steps:
Plug in the machine
Insert a laminating pouch
Observe smooth feeding
🎉 If everything runs smoothly — your repair is successful!
The UNI-T UT18B MAX Digital Multimeter is a compact and versatile measuring tool designed for electronics troubleshooting, electrical maintenance, and DIY projects. In this blog, we walk through the unboxing experience and real-world function tests, all based on our hands-on video review for practical, real-use evaluation.
A hands-on overview of a compact multimeter built for real-world testing.
1. Unboxing – What’s Inside the Box
Everything you need for testing, neatly packed in one box.
Upon opening the package, the contents are neatly arranged and well-protected. Inside the box, you’ll find:
1× User manual
2 pairs of test leads
Standard gold-plated probes for general measurements
Fine-tipped probes for precision electronics work
1× K-type thermocouple for temperature measurement
⚠️ Note: Batteries are not included, so AA batteries must be prepared separately.
The multimeter itself feels solid, with a rugged casing and a large, easy-to-read display.
2. Powering On the Multimeter
Turn the knob to start simple and straightforward.
To turn on the UNI-T UT18B MAX, simply rotate the selector knob from the OFF position to any measurement mode. Once the knob is turned, the multimeter powers on immediately and the display becomes active.
3. LED Function Test (Built-in LED Terminal)
Instantly check LEDs without probes.
One standout feature of the UT18B MAX is its built-in LED test terminal.
To test an LED:
Insert a 5mm LED directly into the LED testing terminal
The LED lights up immediately upon connection
A green indicator light marks the positive terminal, making LED polarity identification quick and hassle-free.
4. DC Voltage Test (Adjustable Power Supply)
Accurate voltage readings you can trust.
Next, we tested DC voltage using an adjustable power supply.
Steps:
Set the multimeter to DC voltage mode
Connect the probes to the power supply output
The displayed voltage closely matches the set output of the power supply, showing stable and accurate voltage measurement.
5. DC Current Test
Reliable current measurement for circuit analysis.
For DC current measurement:
The multimeter is connected in series with the circuit
The probe is inserted into the correct current input terminal
The UT18B MAX displays the current reading clearly, making it suitable for load testing and circuit diagnostics.
6. Resistance Test (270Ω Resistor)
Precise resistance readings for components.
We tested resistance using a 270-ohm resistor.
Set the selector to resistance mode
Connect probes across the resistor
The measured value is very close to 270Ω, confirming good resistance measurement accuracy.
7. Continuity Test (Breadboard)
Quick confirmation of good connections.
Continuity testing is essential for checking wiring and connections.
Set the multimeter to continuity mode
Connect probes through a breadboard path
An audible beep confirms a complete and continuous connection.
8. Temperature Test (Thermocouple + Soldering Iron)
Fast and responsive temperature measurement.
Using the included K-type thermocouple, we tested temperature measurement.
Set the multimeter to temperature mode
Apply heat using a soldering iron
The temperature reading rises smoothly and responds quickly, making this function useful for electronics repair and thermal monitoring.
If you're using the Saike 952D rework station, sooner or later, you might need to replace the soldering iron handle due to wear, damage, or inconsistent heating. In this post, we’ll walk you through the unboxing, installation, and testing of a new replacement handle — step by step!
Replace the soldering iron handle.
📦 What’s in the Parcel?
We ordered a compatible replacement soldering handle for the Saike 952D, and here’s what came in the parcel:
Components required for replacement.
✅ 1x Soldering Iron Handle
✅ 2x Spare Heating Elements
✅ 🔧 Pre-installed Heating Element in the Handle
That’s right — the new handle already comes with one heating element installed, so it’s ready to use immediately. The additional two spare heating elements are a great bonus for future replacements.
🛠️ How to Replace the Soldering Handle
Replacing the handle is quick and easy. Just follow these simple steps:
1. Power Off & Disconnect
Make sure the Saike 952D is turned off and unplugged for safety. Let the existing handle cool down if recently used.
2. Unplug the Old Handle
Unplug the old handle soldering iron.
Locate the connector of the soldering iron handle at the front of the station. Gently unplug it by unscrewing or pulling it out, depending on the model.
3. Plug In the New Handle
Plug the new handle soldering iron.
Take your new handle and plug it into the same port. Make sure the connection is secure.
🔥 Powering On & Setting the Temperature
Once everything is connected:
Setting the temperature.
Turn the Saike 952D back on.
Switch to the soldering iron mode.
Set your desired temperature — we recommend starting at 350°C for general testing.
The station should recognize the new handle and begin heating immediately.
🧪 Testing the New Handle
Test with the solder wire.
Grab some soldering wire and try it out on a small PCB or scrap components. The heating should be consistent, and the solder should melt smoothly. If everything works well, your replacement is a success!
✅ That’s It — You're Done!
With just a few simple steps, you’ve successfully replaced your Saike 952D soldering iron handle. Whether you're a hobbyist or pro technician, this quick upgrade keeps your station running like new.
Have you ever wanted a light that turns ON automatically when it’s dark and OFF when it’s bright? In this beginner-friendly project, we’ll show you how to build a simple light-sensitive LED control system using an Arduino and an LDR (Light Dependent Resistor) module.
Simple LED Auto ON/OFF
📦 What You’ll Need
To get started, you will need the following components:
Components required for this tutorial
✅ Arduino UNO × 1
✅ 3-pin LDR Module × 1
✅ Jumper Wires × 1
✅ USB cable for Arduino × 1
✅ Resistor 220Ω × 1
✅ Breadboard × 1
🛠️ Circuit Wiring
Here’s how to connect each component to the Arduino:
3-pin LDR module wiring
3-pin LDR Module
✅ VCC → 5V on Arduino
✅ GND → GND on Arduino
✅ A0 → Analog pin A0 on Arduino
LED and resistor wiring
LED and Resistor
✅ LED Anode (long leg) → Digital pin 9 on Arduino
✅ LED Cathode (short leg) → 220Ω resistor → GND on Arduino
The connection between components and Arduino
💻 Uploading the Code
After wiring everything up, connect the Arduino to your computer using a USB cable. Then, upload the following code, or you can download the code HERE.
int ldrPin = A0;
int ledPin = 9;
int threshold = 500;
void setup() {
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}
void loop() {
int ldrValue = analogRead(ldrPin);
Serial.println(ldrValue);
if (ldrValue < threshold) {
digitalWrite(ledPin, HIGH); // It's dark, turn on LED
} else {
digitalWrite(ledPin, LOW); // It's bright, turn off LED
}
delay(200);
}
Open Arduino IDE and copy-paste the code
The value 500 is the light threshold. You can check the actual LDR readings via the Serial Monitor and adjust this number depending on your room lighting conditions.
🧪 Test the System
In low light, the LED should turn ON.
In bright light, the LED should turn OFF.
📌 Conclusion
This project is a simple yet powerful introduction to sensor-based automation using Arduino. By combining a Light Dependent Resistor (LDR) with an LED, you’ve created a system that can react to ambient light—automatically turning the light ON in the dark and OFF in bright conditions.
Often, you don't need to know the state of a digital input all the time, but you just need to know when the input changes from one state to another. For example, you want to know when a button goes from OFF to ON. This is called state change detection, or edge detection.
List Item
Arduino Uno
LED
Pushbutton
1 Resistor (150 ohm to 330 ohm) and 1 Resistor (10k ohm)
Description
This example demonstrates the use of pinMode(INPUT_PULLUP). It reads a digital input on pin 2 and prints the results to the serial monitor.
Each time the input pin goes from LOW to HIGH (e.g. because of a push-button press), the output pin is toggled from LOW to HIGH or HIGH to LOW. There's a minimum delay between toggles to debounce the circuit (i.e. to ignore noise).
List Item
Arduino Uno
LED
Pushbutton
1 Resistor (150 ohm to 330 ohm) and 1 Resistor 10k ohm
Turns on and off a light emitting diode (LED) connected to a digital pin, without using the delay() function. This means that other code can run at the same time without being interrupted by the LED code.
