20 Years of Laptop Tingling. How MOKiN Built the Charger That Finally Stops It.
TL;DR — The laptop tingle — that tingle, vibration, or buzz — sometimes a mild electric shock — when you touch a charging laptop or metal-body phone — has existed since at least 2007, documented in Apple forums before GaN chargers were even invented. For nearly 20 years, the charger industry treated it as an unavoidable side effect of compact 2-pin design. MOKiN disagreed. TrueGround is the world's first compact Class 1 grounded GaN charger — engineered in Malaysia to eliminate leakage current permanently, reducing it from ~166 µA to ~2 µA.
In 2007, a user on the Apple Community forums asked why their MacBook felt like it was delivering a mild electric shock when touched while charging. Hundreds of others said they'd noticed the same thing on their laptops — and later on iPhones, Samsung Galaxy phones, and every other metal-chassis device. The replies explained it was a known phenomenon. Normal. Nothing to worry about. For 20 years after that, nothing changed. This is the story of why — and how MOKiN changed it.
From the first forum report in 2007 to TrueGround's launch in 2026 — a problem that outlasted the entire rise of GaN charging.
2007: The Year the Laptop Tingle Was First Documented
In 2007, a thread on the Apple Community forums asked a simple question: why does my MacBook give a mild electric shock — or strange vibration or tingling — when I touch the casing while it's plugged in? The replies came quickly — dozens of users confirming the same experience. The explanation was already understood: it was leakage current from the charger's Y-capacitors, flowing to the laptop chassis through the 2-pin ungrounded connection (or, in Malaysia and Singapore, through chargers that use a plastic dummy earth pin to fit the 3-pin socket — still Class 2, still no real ground path). Users were told it was normal. Within safe limits. Nothing to fix.
That thread still exists today. The year was 2007 — before GaN chargers existed, before USB-C was a standard, and nearly two decades before a company in Malaysia would decide the answer "it's normal" was simply not good enough.
What is significant about 2007 is not that the tingle was first noticed then — it almost certainly predates that thread. What is significant is that it was documented, understood, and accepted. The physics was clear. The cause was known. The fix — an earth connection — was known. And yet, for the next 17 years, the compact charger industry built millions of products that continued to produce the same leakage current and deliver the same tingle to the same users, on the same laptops, in the same living rooms and offices.
Why the Charger Industry Accepted the Tingling as Inevitable
Understanding why the industry did not act requires understanding the constraint they were designing around. A compact 3-pin charger with a genuine earth connection — Class 1 — is more complex to engineer than a 2-pin Class 2 design. The earth path must be properly connected through the full power supply circuit, not just a decorative or plastic dummy pin on the plug — a common workaround in Class 2 chargers sold in Malaysia that allows the plug to fit the 3-pin socket without providing any real ground protection. The charger must pass both Class 1 safety testing and EMC certification in the same compact form factor. This adds design complexity, certification cost, and manufacturing challenges that most charger makers were not motivated to take on.
The IEC 62368-1 safety standard, which governs charger safety, sets a leakage current limit of 250 µA — a level that most users can feel, particularly in markets with 230–240V mains like Malaysia and Singapore, but which does not represent an acute hazard to a healthy adult. Charger makers could certify their Class 2 products, sell them, and point to the standard when users asked why the tingle existed.
The standard provided cover. Compact design was the incentive. The result was 20 years of Class 2 chargers at every price point, from every manufacturer, producing the same leakage current and the same user experience. No one built a compact Class 1 alternative — not because it was impossible, but because the market had been conditioned to accept the status quo.
"The fix was always known. An earth connection eliminates leakage current at the chassis. The engineering question was whether it could be done in a compact GaN form factor. MOKiN's answer was yes."
The GaN Era Made the Tingling Worse — Not Better
When Gallium Nitride (GaN) power semiconductor technology matured around 2018 and compact GaN USB-C chargers began appearing in quantity, there was widespread expectation that the new generation of chargers would solve the problems of the old. GaN chargers were faster, smaller, and ran cooler than their silicon counterparts. Reviews were uniformly positive.
What those reviews missed: the tingling sensation was unchanged. GaN technology improves switching efficiency — it does not change a charger's electrical safety class, and it does not remove Y-capacitors. A compact GaN charger is still Class 2. Its Y-capacitors still produce leakage current. The current still appears on the laptop chassis and still flows through the user when they are grounded.
In Malaysia and Singapore, where mains voltage is 240V and 230V respectively, the situation was quietly made worse by the rise of GaN. The compact GaN charger became the default choice for laptop users — replacing the older, larger OEM brick chargers that, ironically, many were Class 1 by design, with genuine earth connections. A user who replaced their original Dell or HP wall adapter with a sleek compact GaN unit may have inadvertently traded a Class 1 charger for a Class 2 one — and started noticing the tingle for the first time.
By 2022, the best-selling compact chargers on Shopee and Lazada were all GaN, all Class 2, and all producing approximately 166 µA of leakage current at 240V mains. The tingle problem was, in terms of market penetration, at its peak.
The Engineering Challenge: Compact, Class 1, and GaN — All Three
The TrueGround development goal was deceptively simple to state and genuinely difficult to achieve: build a compact GaN charger that is Class 1, with a properly connected earth pin, certified across the full power range, in a form factor suitable for everyday use in the Malaysian and Singaporean market.
Every prior attempt to combine compactness with Class 1 grounding had run into the same set of constraints:
- Earth pin physical size: The BS 1363 3-pin plug used in Malaysia and Singapore has a larger earth pin than the two live/neutral pins. A compact charger body must accommodate it without becoming inconveniently bulky.
- Internal earth routing: The earth connection must be electrically connected through the charger's internal circuit to provide a genuine low-resistance path for leakage current. Decorative earth pins — physically present but not connected — do not eliminate leakage and do not achieve Class 1 certification.
- GaN topology compatibility: The high-frequency switching of GaN power supplies introduces additional considerations for the earth path design, requiring careful attention to ensure the earth connection does not introduce new interference pathways while eliminating leakage current.
- Certification across five wattage levels: Achieving Class 1 certification for a single product is one challenge. Achieving it across a product family from 20W to 140W, with consistent leakage performance, is another.
TrueGround™ technology is MOKiN's engineering solution to all of these constraints simultaneously. The result is a compact GaN charger that passes Class 1 safety certification, maintains ~2 µA leakage current across the full power delivery range, and fits natively into every Malaysian and Singaporean wall socket.
What TrueGround™ Actually Does — and Why It Works
The operating principle of TrueGround™ technology is straightforward in concept, though technically demanding in execution: provide a properly connected earth path within a compact GaN charger that intercepts Y-capacitor leakage current before it reaches the device chassis.
In a standard Class 2 charger, Y-capacitors bridge the mains input side and the output side of the power supply. The leakage current they produce appears on the output side — and with no earth pin to provide a better path to ground, it flows into the connected device's chassis. When the user touches the chassis and is grounded (bare feet on tiled floor, hand on metal desk), the current flows through them.
In a TrueGround Class 1 grounded GaN charger, the earth pin connects to the building's ground through the wall socket. The charger's internal earth path provides a low-resistance route for Y-capacitor leakage current to flow to earth before it reaches the output side. The current takes the earth route — path of least resistance — and never arrives at the laptop chassis in any significant quantity.
The measured result: A standard Class 2 GaN charger at Malaysia's 240V mains produces approximately 166 µA of leakage current at the device chassis. A MOKiN TrueGround Class 1 grounded GaN charger at the same 240V mains produces approximately 2 µA — a reduction of over 98%. The laptop tingle disappears on first use. The same result holds for metal-body phones: iPhone aluminum frames, Samsung Galaxy metal builds, and similar devices experience the same elimination when charged via TrueGround.
Built for Malaysia and Singapore — Not Adapted From Elsewhere
Most compact charger products are designed for one market — typically the US (NEMA 2-pin) or Europe (Schuko 2-pin) — and adapted for Malaysia and Singapore with a plug adapter or a localised variant. This approach preserves the 2-pin architecture that works in those markets and simply changes the physical plug shape — often adding a plastic dummy earth pin so the charger fits a Malaysian 3-pin socket, while remaining Class 2 internally.
TrueGround was designed from the beginning for the BS 1363 3-pin infrastructure of Malaysia and Singapore. The 3-pin plug is not an adapter — it is integral to the product's engineering. The earth pin is not ornamental — it is the mechanism by which leakage current is eliminated. The product works correctly only because it was designed for a market that has genuine earth connections at every wall socket.
This is why TrueGround is not available as a 2-pin version. A 2-pin TrueGround would not be Class 1 — it would simply be a Class 2 GaN charger without the defining feature that makes TrueGround what it is. The 3-pin design and the MY/SG market are inseparable from the product's purpose.
MOKiN is a Malaysian company. The tingle problem is more pronounced in Malaysia and Singapore — at 240V and 230V respectively — than in any other major consumer electronics market. The product exists because the team building it lived with the problem every day, understood it personally, and had both the motivation and the engineering context to fix it properly.
The TrueGround Story: Key Milestones
| Year | Milestone | Significance |
|---|---|---|
| 2007 | Laptop tingle documented in Apple Community forums | Problem publicly known; root cause (Y-cap leakage) understood; industry response: "it's normal" |
| 2012 | GaN power semiconductors enter commercial charger design | New technology for efficiency — no change to electrical safety class; all compact GaN chargers remain Class 2 |
| 2018 | Compact GaN USB-C chargers go mainstream globally | Chargers get smaller and faster; laptop tingle remains unchanged; many users replace Class 1 OEM bricks with Class 2 GaN |
| 2022 | GaN chargers dominant on Shopee and Lazada (MY/SG) | ~166 µA leakage at 240V standard across all best-selling compact chargers; tingle problem at peak market reach |
| 2026 | MOKiN TrueGround launches — world's first compact Class 1 GaN charger | Leakage current reduced from ~166 µA to ~2 µA; tingle eliminated permanently; available 20W–140W |
| 2026 | Full 5-model TrueGround lineup: 20W, 33W, 45W, 65W, 140W | Class 1 grounded GaN protection available for every device — from earbuds to pro laptops |
The Problem Took 20 Years to Fix. The Fix Takes One Charger.
MOKiN TrueGround — the world's first compact Class 1 grounded GaN charger. Available on mokin.my, Shopee, and Lazada.
Shop MOKiN TrueGround →Frequently Asked Questions
Q: How long has the laptop tingle problem existed?
The laptop tingling sensation from charger leakage current has been documented since at least 2007, when it was reported and discussed on the Apple Community forums. The physics behind it — Y-capacitor leakage in 2-pin Class 2 chargers (including those with a plastic dummy earth pin) — has been understood by engineers for decades. The reason it persisted for nearly 20 years is that the charger industry accepted it as an unavoidable trade-off of compact 2-pin design, and it remained within IEC 62368-1 safety limits (250 µA). MOKiN TrueGround is the first compact GaN charger built to eliminate it rather than accept it.
Q: Why didn't other charger companies fix the laptop tingle problem?
Building a compact Class 1 grounded GaN charger — one with a genuine earth connection that eliminates leakage current — is significantly more complex than building a standard Class 2 compact charger. It requires careful internal earth path design, Class 1 safety certification, and a 3-pin plug architecture that is native to specific markets (like Malaysia and Singapore) rather than universally compatible. Most charger makers optimised for the global 2-pin market and relied on the IEC safety standard to justify the status quo. MOKiN built for the MY/SG market specifically, where the tingle problem is most pronounced at 240V/230V mains, and developed TrueGround™ technology to address it directly.
Q: What is TrueGround™ technology?
TrueGround™ is MOKiN's proprietary engineering approach to achieving Class 1 grounding in a compact GaN charger form factor. It combines a properly connected earth pin (integrated into the BS 1363 3-pin plug), an internal earth path that intercepts Y-capacitor leakage current before it reaches the charger's output side, and GaN power delivery circuitry that operates correctly with the earth path in place. The result is a charger that measures approximately 2 µA of leakage current at the device chassis — compared to approximately 166 µA from a standard Class 2 GaN charger at Malaysia's 240V mains — eliminating the tingle sensation permanently.
Q: Does the laptop tingle problem affect newer laptops and phones too?
Yes. The laptop tingle, vibration, or buzz is caused by Y-capacitor leakage current in the charger, not by any property of the device being charged. Any metal-chassis device connected to a Class 2 charger will exhibit the effect: MacBook (all generations including M4), Dell XPS, HP Spectre, Lenovo ThinkPad, Asus ZenBook, Surface Laptop, as well as metal-frame iPhones and Samsung Galaxy phones. The sensation does not diminish with newer devices because the root cause is in the charger architecture, not the device. Using a MOKiN TrueGround Class 1 grounded GaN charger eliminates it for any connected device.
Q: Is MOKiN TrueGround available outside Malaysia and Singapore?
TrueGround uses a BS 1363 3-pin plug, which is native to Malaysia, Singapore, the UK, and several other countries with the same socket standard. The product is currently sold primarily through mokin.my, Shopee, and Lazada for the Malaysian and Singaporean market. The 3-pin plug design is integral to TrueGround's function — the earth connection that eliminates leakage current requires a socket that has a grounded earth terminal, which Malaysian and Singaporean wall sockets provide as standard.
Q: Can my phone's tingle be fixed with TrueGround too?
Yes. The faint buzz or vibration that metal-body phones experience when charged with a 2-pin Class 2 charger (or a charger with a plastic dummy earth pin) — iPhone aluminum frame, Samsung Galaxy flagships, and other metal-chassis phones — comes from the same Y-capacitor leakage mechanism. Charging your phone with a MOKiN TrueGround 20W or 33W model eliminates the sensation in exactly the same way. The 20-year problem applies to every metal device on a Class 2 charger — and the fix applies equally to all of them.
Last Updated: May 12, 2026
