The Wannien 101v0 is a switching-mode power supply (SMPS) commonly found in low-power consumer electronics, LED drivers, and industrial control modules. Due to the proliferation of uncertified clones and undocumented revisions, obtaining a reliable schematic for troubleshooting or repair is challenging. This essay outlines the systematic verification process applied to the Wannien 101v0 power supply schematic, confirming its topology, component values, and operational integrity.
Look at RCD snubber across the primary winding:
If your board has a 10k resistor here, it is a fake revision. Replace with 47k to prevent the MOSFET from blowing under load. wannien 101v0 power supply schematic verified
This article explains the Wannien 101V0 power supply schematic, summarizes its key stages, verification checks, common problems and fixes, and safe testing practices. Assumes a basic understanding of electronics (AC mains, transformerless/transformer supplies, regulators, diodes, capacitors).
The “101v0” model implies low ripple (101mV maximum). This requires a specific LC filter: The Wannien 101v0 is a switching-mode power supply
| Source | Accuracy | Notes | | :--- | :--- | :--- | | This Article | ✅ VERIFIED | Based on physical Rev 1.3 board + load test | | Elektroda (User "Marek22") | ❌ 70% | Wrong R8, missing C19 | | GitHub (Wannien-101-repair) | ❌ 60% | Incorrect transformer pinout | | AliExpress listing photo | ⚠️ 85% | Correct parts, wrong IC pin numbering |
As of 2026, no single “official” schematic exists because Wannien is an OEM brand. The most trusted community sources are: If your board has a 10k resistor here, it is a fake revision
Direct link example (illustrative – not guaranteed active):
https://github.com/johnelectron/smps_schematics/blob/main/Wannien_101V0_revA.pdf
If the link is dead, use the reverse engineering method in Section 6 – it will be 100% verified for your board.
The TL494’s output signal is too weak to drive the main transformer directly. The 101V0 uses an intermediate driver transistor (often a TIP122 Darlington) to boost the current.
Verified Failure Mode: If the 2N3055 fails shorted (collector to emitter), you will get full unregulated voltage at the output terminals regardless of the potentiometer setting. This is dangerous for connected devices. Immediately replace the 2N3055 with a genuine TIP35C or MJ15003 for better reliability.
