Circuit diagram for 12V 200mA DC regulated power supply for single CCTV camera

The discussion focuses on designing a 12V, 200mA regulated DC power supply suitable for a single CCTV camera. A recommended approach includes using a transformer-based linear power supply with a 12V regulator circuit, with a provided example circuit diagram originally designed for 230V input but adaptable to 120V transformers. Alternative solutions suggest employing ready-made regulated power supplies available from electronics suppliers, typically offering higher current ratings (e.g., 300mA to 1000mA). Another option is to utilize switched-mode power supplies (SMPS), such as those salvaged from satellite receivers, provided the output voltage is stable and noise is minimal. Current limiting is generally unnecessary unless specific load conditions require it; if needed, a simple resistor can be used. For custom SMPS design, obtaining isolated transformers or inductors is challenging, and using reference designs or demo boards from semiconductor manufacturers like Power Integrations, Texas Instruments, National Semiconductor, Intersil, or Linear Technology is advised. Purchasing inexpensive SMPS units from eBay is a practical alternative, as they include the necessary isolation components and regulation circuitry.
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