{100} CCTV SMPS Repair 😱 गलत IC और Feedback की ये गलती मत करना! UC3842 vs UC3843 vs UC3844 vs UC3845

In this video, I repair a 12V CCTV Camera SMPS and explain the faults found during troubleshooting. I also explain the important differences between UC3842, UC3843, UC3844, and UC3845 PWM controller ICs used in SMPS circuits. 🔧 Faults Found in CCTV SMPS: Incorrect IC Installed: The wrong IC was fitted in the power supply. Feedback Circuit Issue: The optocoupler started conducting at around 7V feedback voltage, even though the power supply was designed for a 12V output. Faulty 1KΩ Preset: The preset used for output voltage adjustment was defective. 📚 Topics Covered in This Video: 👉CCTV SMPS repair and troubleshooting 👉UC3842 vs UC3843 vs UC3844 vs UC3845 👉Differences in startup voltage and undervoltage lockout (UVLO) 👉Differences in maximum duty cycle 👉Optocoupler feedback circuit operation 👉Output voltage adjustment using a 1KΩ preset 👉Practical SMPS fault diagnosis and repair. . . We Sell: 👉 All Electronic Components 👉All SMPS Adapters 👉Wifi Smart Switch 👉Modules. 👉RF Remote Switches. For order. whatsapp number 👉8200165115 मेरे पास सभी इलेक्ट्रानिक्स सामान मिलता है order करने के लिए 👉8200165115 पर whatsapp करें! This video is useful for electronics technicians, beginners, and anyone interested in learning practical SMPS repair techniques. 👍 Like, Share, and Subscribe to Sandeep Electronics for more electronics repair tutorials, SMPS circuit explanations, and troubleshooting videos. #CCTVSMPS #SMPSRepair #UC3842 #UC3843 #UC3844 #UC3845 #PWMController #Optocoupler #FeedbackCircuit #ElectronicsRepair #SandeepElectronics