Wannien 101v0 Power Supply Schematic Verified |link| -
LED strips, 3D printers (as auxiliary supply), CCTV cameras, audio preamps, battery chargers.
The second op-amp compares the voltage drop across a low-resistance shunt resistor against the current potentiometer setting.
Based on technician consensus for this specific board model: Capacitors
: Manages four independent transistor switch paths (labeled OUT1 through OUT4 ). wannien 101v0 power supply schematic verified
Miscellaneous rails and references
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One or more internal diodes short-circuit, allowing raw AC to cross into the DC domain, blowing the fuse. Symptom B: Power Supply "Ticking" or "Hiccupping" LED strips, 3D printers (as auxiliary supply), CCTV
Incorrect schematics show a 1.5M or 2M resistor from bulk capacitor to IC pin 8. 4.7M Ohms (Yellow, Purple, Green, Gold). Why it matters: Using a 2M resistor will overheat the LD7750R at 240VAC. Using a 10M will fail to start below 100VAC.
The bulk filtering section consists of large aluminum electrolytic smoothing capacitors (typically two 4700µF or 6800µF capacitors rated at 50V). If your unit has an underlying hum or drops voltage drastically under load, these capacitors are prime suspects. 3. The Control and Error Amplification Loop
If the output voltage is "pumping" (fluctuating rapidly), the issue is often a faulty optocoupler or a dried-out capacitor on the PWM controller's VCC pin. 4. Safety Warning Miscellaneous rails and references user wants a long
A medium-power transistor (such as a TIP41C or BD139) amplifies the small correction signal from the op-amps.
Information from repair logs has identified specific components on the 101V0 board. These can be crucial starting points for troubleshooting:
The 12–15V DC input passes through an initial decoupling network featuring electrolytic capacitors. These capacitors suppress ripple voltage coming from external transformers. The power then feeds an onboard IC regulator that lowers the voltage down to 5V to power logic components and microcontrollers. 2. Transistor Switch Matrix ( OUT1 – OUT4 )
What is your specific power supply displaying (e.g., dead, clicking, smoking, or low voltage)?
When troubleshooting, the allows you to trace the voltage from the input to the output, identifying where the signal breaks.
