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This circuit is also use operational amplifier IC LM324 to drive the VN64GA with the error signal and to control output voltage. This output voltage is pulsating DC , which is quite satisfactory for battery charging. This circuit also can be converted to the system regulated DC supply. You do this by increased C2 and anoother electrolytic capacitor is added across the load. The respon time is very fast, determined by the op amp. Schematic and troubleshooting below : If the circuit not work , Perhaps the cause of : AC cable disconnected Transformer is damaged or leaking.  Broken or leaky diode. Installation of inverted foot elco. Instrallation of the components of the upside , particularly on the transistor , examine the placement of the feet emitter , collector and base. IC damaged. Soldering is less sticky. Line PCB damaged.

Today we'll answer the frequently asked question. "why LED strip light won't light up". If you find your flexible LED strip light won't light up or power up, you may check the following troubleshooting information for help. 1. The lamp beads of led strip light must be broken or damaged during transportation if the light is not covered with full protection. 2. There must be a faulty at the light's soldering points. The soldering may come off if there is any shock during transportation. 3. Soldering with poor quality may cause embrittlement or shedding when the strip light is bent for use. 4. Cheat on tin soldering materials can also cause the same problem as the 2 point we just mentioned. 5. LED lights with flexible installation bending angle is too large, resulting in LED lights with flexible joints and lead to bright copper separation flexible led strip lights 6. A excessive bending may result in the disconnection between the joints and copper foil. 7. Th...