AC Mains ----[Fuse]----[EMI Filter]----[Bridge Rectifier]----[100µF/400V]----+ | [Transformer Primary] | MOSFET (IRF840) Drain | Source ----[0.22Ω]---- GND | Gate from UC3843 Output | UC3843: VCC (pin7) from aux winding, Comp (pin1), FB (pin2), Isense (pin3) to source resistor | Output winding ----[MBR20100CT]----[1000µF]---- +12V DC @ 5A | GND

The LM338 Pinout: Pin 1 (Adjust), Pin 2 (Output), Pin 3 (Input). How the Circuit Works Step-Down:

: Audio equipment or sensitive lab electronics where electrical noise must be minimal. 2. Switch Mode Power Supply (SMPS)

The transformer drops your wall outlet voltage down to 15V AC. This AC voltage passes through the bridge rectifier, which converts the sine wave into a pulsating DC signal. 2. Filtration

Uses high-frequency switching. It is highly efficient and compact but much more complex to build from scratch due to EMI (Electromagnetic Interference) concerns.

The transformer reduces the high-voltage AC (e.g., 220V/110V) to a safer low-voltage AC (15-18V), which is essential because the regulator needs a slightly higher voltage than the target 12V to operate efficiently. Rectification: The bridge rectifier converts the AC to pulsed DC. Smoothing:

At 5 Amps, linear regulators like the LM338 dissipate a lot of heat. A substantial heatsink is Capacitance: