Peleigho Apex Limited

19/08/2026

13/08/2026

10/08/2026. 📝The audio was invisible, the video clean and clear. The circuit was silent. But mathematics and physics don't lie. The electronics prophet found what was missing. 🔥

05/08/2026

Stop buying fuel during the day. ☀️

Peleigho Inverter runs directly from solar panels — no battery needed during sunlight hours.

✅ Works with Pylontech, other lithium, and lead-acid batteries
✅ Accepts up to 500V DC input
✅ Saves you fuel costs from day one

One inverter. All battery types. No compromises.

DM for details. 📩

23/07/2026

6kW Peleigho inverter + 15kWh lithium battery — installed. 🔋

22/07/2026

BJT vs MOSFET : Where They Are Used and Why They Work Better Together

The choice between BJT and MOSFET depends on the application.

Audio Amplifiers

BJTs are still widely used in analogue audio amplifiers because they provide excellent linear amplification and good gain characteristics. MOSFETs are also used in high‑quality audio amplifiers for a different sound characteristic and good thermal stability.

Inverter Systems

Modern inverter systems mostly use MOSFETs, especially low and medium power inverters. Their fast switching capability allows engineers to create efficient inverter designs with reduced heat generation. For very high‑power systems, engineers may use IGBTs, high‑power MOSFETs, or parallel MOSFET arrangements.

Power Supplies

MOSFETs dominate modern switching power supplies because they can switch thousands or millions of times per second. This allows transformers and inductors to become smaller, improving efficiency and reducing size.

Digital Electronics

Almost all modern digital circuits use MOSFET technology. Microprocessors, memory chips, and controllers contain millions of tiny MOSFETs because they consume very little power.

Can BJT and MOSFET Work Together?

Yes. In many circuits, BJTs and MOSFETs complement each other.

For example, in an inverter:
A small BJT driver stage can provide the required current to quickly charge and discharge the MOSFET gate.
The MOSFET then handles the high‑current switching operation.

This combination gives: fast switching, better gate control, reduced losses, and improved reliability.

Another example is the IGBT (Insulated Gate Bipolar Transistor), which combines:
MOSFET input characteristics (voltage‑controlled gate)
BJT output characteristics (high current capability)

IGBTs are commonly used in industrial motor drives, solar inverters, electric vehicle systems, and high‑power converters.

BJTs and MOSFETs are not competitors where one completely replaces the other. They are tools designed for different purposes.

A BJT is excellent when high gain and analogue amplification are required.
A MOSFET is excellent when fast switching, efficiency, and low power consumption are important.

In modern power electronics, MOSFETs have become the preferred choice for many inverter and switching applications. However, understanding both devices allows engineers to design better circuits by using each device where it performs best.

The choice of transistor is not about which one is better; it is about which one is more suitable for the job.

20/07/2026

BJT vs MOSFET – Part 1: How They Work and Why It Matters

In electronic circuits, two of the most important semiconductor devices used for switching, amplification, and power control are Bipolar Junction Transistors (BJTs) and Field Effect Transistors (FETs), especially MOSFETs.

Although they perform similar functions, they operate in different ways. Understanding the relationship between them helps engineers select the right device for applications such as amplifiers, power supplies, inverters, motor controllers, and digital circuits.

A simple way to remember the relationship between their terminals is:

BJT: Base – Collector – Emitter
MOSFET: Gate – Drain – Source

The control terminal of both devices performs a similar function:

Base = Gate
Collector = Drain
Emitter = Source

However, the method of control is different.

The Control Difference: Current Control vs Voltage Control

A BJT (Bipolar Junction Transistor) is a current-controlled device. A small current applied to the base controls a much larger current flowing between the collector and emitter.

A MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is a voltage-controlled device. The voltage applied between the gate and source terminals controls the current flowing between the drain and source.

Unlike a BJT, the MOSFET gate requires very little current because the gate is electrically insulated from the channel by a thin oxide layer.

BJT → Base current controls collector current
MOSFET → Gate voltage controls drain current

Bipolar Junction Transistor (BJT)

A BJT is made from three semiconductor regions: Emitter, Base, and Collector. There are two main types: NPN and PNP.

Advantages of BJT:
Very high current gain — excellent for audio amplifiers
Lower voltage drop when properly driven
Smooth and linear amplification response
Relatively inexpensive

Disadvantages of BJT:
Requires continuous base current to operate
Base current creates additional losses
Generates more heat when switching at high speed (slower than MOSFETs)
Current gain changes with temperature — requires careful design

Field Effect Transistor (FET and MOSFET)

A Field Effect Transistor controls current using an electric field. The most common type used in power electronics is the MOSFET.

Advantages of MOSFET:
High switching speed — ideal for inverters, power supplies, motor controllers
Very little drive power required — gate does not continuously consume current
Easier to connect in parallel for high-current applications
Lower heat generation

Disadvantages of MOSFET:
Gate oxide is thin — sensitive to static electricity (ESD)
-Has ON‑resistance (RDS(on)) causing power loss: Power loss = I² × RDS(on)
Affected by voltage spikes when switching inductive loads

16/07/2026

Why you cannot swap these two capacitors — and what happens when you do"

So you have two capacitors. One stores 100× more charge. The other handles 8× higher voltage.

Now let us talk about where each one belongs — and why using the wrong one can destroy your circuit.

The 6800µF, 50V Capacitor: High Current, Low Voltage

Used in low-voltage, high-current circuits: power supply smoothing, inverter DC bus filtering, audio amplifier power stages, motor control circuits

Advantage: Stores large amounts of charge, reduces ripple voltage, stabilises DC supply

Limitation: Cannot handle high voltage. Applying more than 50V will damage it

The 68µF, 400V Capacitor: High Voltage, Low Current

Used in high-voltage applications: SMPS power supplies, TV power boards, UPS systems, inverter high-voltage DC sections

Advantage: Can safely handle up to 400V — essential after AC mains rectification

Limitation: Cannot deliver large currents quickly. Using it in a low‑voltage, high‑current circuit will result in poor filtering and unstable operation

A common mistake is thinking: "Both are capacitors, so one can replace the other."

That is incorrect.

6800µF, 50V cannot replace 68µF, 400V because it cannot withstand the voltage.

68µF, 400V cannot replace 6800µF, 50V because it does not have enough storage capacity.

The correct capacitor must match: capacitance requirement, voltage requirement, ripple current rating, temperature rating, and physical size.

Practical example in an inverter:

The 6800µF, 50V capacitor is placed near the battery input to stabilise the DC supply feeding MOSFETs.

The 68µF, 400V capacitor is used in the high‑voltage DC section of a transformerless inverter.
Both store energy. But they perform different jobs because the circuit requirements are different.

Engineering lesson:
A capacitor is not judged only by its physical size. A small capacitor can handle very high voltage, while a larger capacitor can store much more energy at a lower voltage.

Selecting the correct capacitor requires understanding the voltage, current, frequency, and purpose of the circuit.

Have you ever seen a capacitor fail because of incorrect selection? Share your experience below.

14/07/2026

"Same name, completely different jobs: Capacitance vs Voltage Rating"

From the picture, the two capacitors are not the same size electrically, even though they look similar in function.

The black capacitor is 6800µF, 50V.
The green capacitor is 68µF, 400V.

Which one is bigger? The answer depends on what we mean by "bigger."

A capacitor is described mainly by two important values:
Capacitance (µF) — tells us how much electrical charge the capacitor can store.

Voltage rating (V) — tells us the maximum voltage the capacitor can safely withstand.

The black capacitor has a capacitance of 6800µF, while the green capacitor has only 68µF.

This means the 6800µF, 50V capacitor can store 100 times more charge than the 68µF, 400V capacitor.

Mathematically: 6800µF ÷ 68µF = 100

So in terms of energy storage capacity, the 6800µF, 50V capacitor is much larger.
However, the 68µF, 400V capacitor has a much higher voltage rating: 400V ÷ 50V = 8. It can withstand eight times higher voltage.

Therefore, one capacitor is larger in storage capacity, while the other is larger in voltage capability.

Which one would you choose for your circuit — and why?

15/06/2026

RF Lesson I paid for with my spine:

My DC multimeter said the C945 was OFF. V_Base < V_Emitter. Textbook cutoff, right?

Wrong.

It was oscillating so hard it self-biased into Class-C. Pulling 1.85mA while my meter lied to my face.

3 days. 3 rebuilds. 1 waist that still pains.

Lesson: DC rules don't apply when RF is doing its own thing.

Base-leak bias is a real thing, y'all. 📡

RF electronics will humble you


JUNE 12TH - 14TH