S-60-12 Power Supply Circuit Diagram May 2026

Manish smiled. “Let’s listen to its song,” he whispered, pulling out a magnifying glass and a notepad. He began to trace the —a map of how raw, dangerous mains electricity is tamed into gentle, stable DC. Act I: The Frontier – AC Input and EMI Filtering The story starts at the AC input terminals (marked N and L). The first components are not glamorous, but vital. A fuse (F1, typically 3.15A slow-blow) stands as the gatekeeper. Next, a varistor (MOV, often 14D471K) waits like a silent guard. If a lightning surge hits, the varistor short-circuits, blowing the fuse to save the rest of the circuit.

On his cluttered workbench lay a sad, dusty aluminum box. It was an —a 60-watt, 12-volt DC switching power supply. Its once-proud metal casing was dented, its fan grille clogged with years of sawdust. The label read: Input: 100-240V AC, Output: +12V @ 5A . Someone had tossed it because it “smelled like smoke.” s-60-12 power supply circuit diagram

A small variable resistor (VR1, a 1kΩ trimpot) lets you adjust the output from ~10V to 14V. But the real hero is the programmable shunt regulator and an optocoupler (PC817). Manish smiled

Manish traced the copper lines to a small PCB-mounted common-mode (L1). Wrapped around a ferrite ring, two windings let the power through but block high-frequency noise from escaping back into your home’s wiring. After the choke, X2 safety capacitors and small Y-capacitors filter the rest of the noise. Act I: The Frontier – AC Input and

“This capacitor holds the raw power,” Manish said. “But it’s also the most dangerous. It can shock you hours after unplugging.” Now came the magic. The high-voltage DC must be chopped into high-frequency pulses. The switching transistor —a MOSFET, usually a 2SK3878 or 5N60C—acts like a rapid switch, turning on and off tens of thousands of times per second.

“This is the etiquette section,” Manish chuckled. “The power supply says, ‘I will take your energy, but I won’t pollute the radio spectrum.’” Next came the bridge rectifier —a black, square, four-pin component (often a KBL406 or similar). It takes the 120V or 230V AC sine wave and flips the negative humps upward, creating a pulsating DC voltage. Manish scoped it: a bumpy 120Hz waveform (if in North America) or 100Hz (in Europe).

He connected an old LED strip. It blazed to life.

Manish smiled. “Let’s listen to its song,” he whispered, pulling out a magnifying glass and a notepad. He began to trace the —a map of how raw, dangerous mains electricity is tamed into gentle, stable DC. Act I: The Frontier – AC Input and EMI Filtering The story starts at the AC input terminals (marked N and L). The first components are not glamorous, but vital. A fuse (F1, typically 3.15A slow-blow) stands as the gatekeeper. Next, a varistor (MOV, often 14D471K) waits like a silent guard. If a lightning surge hits, the varistor short-circuits, blowing the fuse to save the rest of the circuit.

On his cluttered workbench lay a sad, dusty aluminum box. It was an —a 60-watt, 12-volt DC switching power supply. Its once-proud metal casing was dented, its fan grille clogged with years of sawdust. The label read: Input: 100-240V AC, Output: +12V @ 5A . Someone had tossed it because it “smelled like smoke.”

A small variable resistor (VR1, a 1kΩ trimpot) lets you adjust the output from ~10V to 14V. But the real hero is the programmable shunt regulator and an optocoupler (PC817).

Manish traced the copper lines to a small PCB-mounted common-mode (L1). Wrapped around a ferrite ring, two windings let the power through but block high-frequency noise from escaping back into your home’s wiring. After the choke, X2 safety capacitors and small Y-capacitors filter the rest of the noise.

“This capacitor holds the raw power,” Manish said. “But it’s also the most dangerous. It can shock you hours after unplugging.” Now came the magic. The high-voltage DC must be chopped into high-frequency pulses. The switching transistor —a MOSFET, usually a 2SK3878 or 5N60C—acts like a rapid switch, turning on and off tens of thousands of times per second.

“This is the etiquette section,” Manish chuckled. “The power supply says, ‘I will take your energy, but I won’t pollute the radio spectrum.’” Next came the bridge rectifier —a black, square, four-pin component (often a KBL406 or similar). It takes the 120V or 230V AC sine wave and flips the negative humps upward, creating a pulsating DC voltage. Manish scoped it: a bumpy 120Hz waveform (if in North America) or 100Hz (in Europe).

He connected an old LED strip. It blazed to life.