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I share IT tutorials and real projects to inspire learners & makers 💻
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Are solar roof tiles a safe and reliable choice?
27/08/2026

Are solar roof tiles a safe and reliable choice?

The swollen top caps was pressed back by the former guy, how will one know the fault ?
22/08/2026

The swollen top caps was pressed back by the former guy, how will one know the fault ?

12/08/2026

4. TESTING COMPONENTS OUT OF CIRCUIT IS MORE RELIABLE

One troubleshooting lesson that frustrated me when I was a beginner was testing components while they were still soldered to the circuit board.

Many times, the readings didn't make sense. A good transistor looked bad, a diode appeared shorted, or an IC seemed faulty. I would replace the component only to discover that the problem was still there.

As I gained more experience, I realized that other components connected to the same circuit can influence your multimeter readings. Resistors, capacitors, coils, and even other semiconductors create alternative paths that can give false or misleading measurements.

That's why, whenever possible, remove the component from the circuit before making your final judgment. Testing it off the board isolates it from the rest of the circuit and gives a much more accurate result.

This doesn't mean you should never test components in-circuit. In-circuit testing is a useful first step because it saves time. But if the reading looks suspicious or doesn't agree with the circuit symptoms, remove the component and test it again out of the circuit before replacing it.

A professional technician doesn't rely on one reading—he verifies it.

Like and follow Bartho. O Techs as we continue this series on practical troubleshooting techniques that every electronics technician should know.

09/08/2026

3. UNDERSTANDING RESISTANCE READINGS (Part 2)

Over the years, one practical lesson I've learned is that healthy semiconductor components rarely show extremely low resistance between their terminals when tested correctly and out of the circuit.

Components such as diodes, transistors, and integrated circuits (ICs) may give different resistance readings depending on the pins you measure. However, if you consistently get very low resistance between certain pins—especially just a few ohms or close to a short circuit—it should immediately raise suspicion.

In many repair cases, a transistor or IC that measures abnormally low resistance has an internal short caused by overheating, excessive current, or electrical stress. The component may still produce a reading on the meter, but that doesn't automatically mean it is healthy.

This is why experienced technicians don't just check whether a component reads. They also ask:

- Is this reading reasonable?
- Does it match the expected behavior of this component?

Always compare your readings with the component's datasheet, a known good component, or your previous troubleshooting experience before concluding that it is faulty.

Experience teaches patterns, but measurements confirm the fault.

Like and follow Bartho. O Techs as we continue this series on professional semiconductor troubleshooting.

06/08/2026

2. KNOW HOW TO INTERPRET RESISTANCE READINGS

One of the most important skills in electronics troubleshooting is understanding resistance readings. It is not enough for a component to simply "read" on a multimeter. The value of that reading also matters.

A component may not be completely open or short-circuited, yet it can still be faulty because its resistance has changed from what it should be.

For example, consider a speaker voice coil. A damaged or overheated voice coil may still show continuity on a multimeter, making someone think it is good. However, if part of the winding has been damaged or shorted between turns, its resistance can become lower than normal. Even though it still reads, the speaker may produce poor sound, distortion, or fail under load.

The same principle applies to many electronic components. A resistor can drift from its rated value, a winding can develop shorted turns, and some semiconductor junctions can show abnormal resistance due to internal damage.

The lesson is simple: Don't just ask, "Does it read?" Also ask, "Is the reading normal?" Knowing the expected resistance range helps you distinguish a healthy component from a faulty one.

Like and follow Bartho. O Techs for the next part of this series, where we'll continue learning practical methods for testing electronic components like a professional.

06/08/2026

1. KNOW THE PINOUTS (PIN FUNCTIONS)

The first step to testing any semiconductor component is knowing the function of each pin. If you don't know what each pin is meant to do, there's a high chance you'll test it incorrectly and reach the wrong conclusion.

Whether it's a transistor, diode, voltage regulator, MOSFET, or integrated circuit (IC), always identify the pinout before taking any measurements.

So, where can you find the pinout?

- Search for the component online.
- Download its datasheet, which contains the pin configuration, electrical characteristics, and other important information.
- You can also use mobile apps such as COMPONENT PINOUT, available on the Google Play Store and Apple App Store. These apps make it easy to identify the pin functions of both old and new electronic components.

Remember, a multimeter can only tell you what is happening between pins. It cannot tell you which pin is the base, collector, emitter, gate, drain, source, anode, cathode, input, or output. That knowledge comes from the pinout.

Once you know the pin functions, troubleshooting becomes faster, more accurate, and more professional.

Like and follow Bartho. O Techs to stay tuned as we move to the next step in semiconductor testing.

06/08/2026

How do professionals know when a transistor, diode, or IC is faulty? Is it just experience, or is there a proper method?

When many people see an electronic component, they either assume it's good or replace it without testing. But every skilled electronics technician knows that proper diagnosis saves time, money, and unnecessary replacement of good parts.

In this series, I'll explain—in the simplest way possible—how to test different semiconductor components and identify whether they are good or faulty using practical methods that every technician and electronics enthusiast should know.

We'll go through them one by one, starting from the basics, so even beginners can follow along.

Like and follow Bartho. O Techs to stay tuned for more electrical tips, electronics hacks, updates, and practical explanations.

03/08/2026

This is informative.

Attention: I am not the originator.

Does Your Mouth Really Need to Touch the Microphone?Many people believe that the closer your mouth is to the microphone,...
03/08/2026

Does Your Mouth Really Need to Touch the Microphone?

Many people believe that the closer your mouth is to the microphone, the better the sound. While getting closer can make the voice sound deeper because of the proximity effect, modern microphone technology has made it possible to achieve excellent results without pressing the microphone against your lips.

Professional microphones such as the Shure SM7B, Electro-Voice RE20, and premium headset microphones can capture a rich, full voice from a comfortable distance when used with a properly adjusted sound system.

Hands-free microphones used by pastors, presenters, broadcasters, and performers are proof that a microphone doesn't have to touch your mouth to produce clear, powerful sound.

Bass vocalists sometimes hold the microphone very close to intentionally boost low frequencies for a particular style. However, that is a creative choice—not a requirement for good sound.

If someone must always press the microphone against their lips just to be heard, the issue may be the microphone technique, gain settings, or the quality of the sound system—not necessarily the distance from the microphone.

Technology has evolved. The goal is not to "eat the microphone," but to reproduce your natural voice with clarity, balance, and the right amount of bass.

What are your thoughts? Have you noticed the difference between older and modern sound systems? Share your experience in the comments!

Like and follow Bartho. O Techs for more electrical tips, electronics explanations, sound system knowledge, and practical technology updates.

Hahahahah😅😅I saw this on social media and I wonder how possible for a professional to produce this.
01/08/2026

Hahahahah😅😅
I saw this on social media and I wonder how possible for a professional to produce this.

Address

No. 3 Ihe Mgbuji Road Near Former Police Station Eha-amufu

412102

Opening Hours

Monday 08:00 - 17:00
Tuesday 08:00 - 17:00
Wednesday 08:00 - 17:00
Thursday 08:00 - 17:00
Friday 08:00 - 17:00
Saturday 08:00 - 17:00
Sunday 14:00 - 17:00

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+2347063957952

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