Schematic: Wannien 101v0 Power Supply
Flip your board over and look for these key ICs. Once you identify the controller, you’re 80% of the way to a schematic.
| Component | What to look for | Likely schematic family |
| :--- | :--- | :--- |
| PWM Controller | 8-pin DIP: UC3842, UC3843, OB2269 | Standard UC3842 Flyback |
| Dual Op-Amp | 8-pin: LM358, LM393 (for voltage/current limit) | Battery charger or LED PSU |
| Main Switcher | MOSFET: 4N60, 7N65, 8N60 | 150W-300W flyback |
| Output Diode | TO-220: MBR20100, SBL2040 (Schottky) | Low voltage, high current |
Tip: If you see an 8-pin DIP near a small transformer and a MOSFET on a heatsink, search for “UC3842 flyback power supply schematic”—it will match 90% of the Wannien 101v0.
Look for additional text on the PCB or casing: wannien 101v0 power supply schematic
These can help reverse-engineer the schematic.
| Component | Value | Role |
|-----------|-------|------|
| F1 | T3.15A 250V (slow-blow) | Input protection |
| BD1 | GBU806 (8A 600V) | Bridge rectifier |
| C5, C6 | 220µF 200V (x2) | Bulk storage |
| Q1, Q2 | MJE13007 (or 13009) | Switching transistors |
| C14, C15 | 330nF 250V (x2) | Half-bridge capacitors |
| T1 | EI33 or EE35 core | Main transformer |
| D9, D10 | MBR20100CT (20A 100V) | Output Schottky |
| U1 | TL494CN | PWM controller |
| U2 | PC817C | Optocoupler |
| U3 | TL431 | Voltage reference |
| L1 | 3.3µH (yellow-white toroid) | Output filter inductor |
The 101V0 uses a Half-Bridge Forward Topology with voltage-mode control. Flip your board over and look for these key ICs
+12V output ---[Resistor Divider]---(TL431 Shunt Regulator)---[LED side of PC817 Optocoupler]---(GND)
PC817 Transistor side ---(Pulls Pin 1 of TL494 low if voltage rises)
This isolates the high-voltage primary from the low-voltage output. Tip: If you see an 8-pin DIP near
The Wannien 101V0 employs an offline flyback converter topology. This topology was selected due to its cost-effectiveness, ability to provide galvanic isolation between the AC mains and the DC output, and its suitability for power ranges typically between 15W and 60W.
The schematic is divided into four distinct functional blocks:
This report provides a detailed technical analysis of the Wannien 101V0 power supply schematic. The 101V0 is a single-output, isolated AC-DC Switch-Mode Power Supply (SMPS) typically utilized in low-to-mid power consumer electronics, LED lighting, or embedded industrial systems. The schematic reveals a standard flyback converter topology utilizing a proprietary Wannien PWM controller, reinforced with standard protection circuitry for over-voltage (OVP), over-current (OCP), and short-circuit protection (SCP).
Since the exact PDF doesn’t exist online, search for these instead (use quotes):
Also check ElectroTanya and Elektroda – search by the PCB silkscreen number (look for a number like W-101V0-A or similar on the board edge).
2010-08-31 
2010-08-31 
