S-60-12 Power Supply Circuit Diagram File

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

Who commands this switch? A tiny 8-pin chip: the . In most S-60-12 units, it’s a UC3842 or KA3842 (a current-mode PWM controller). Manish found the chip near the optocoupler. s-60-12 power supply circuit diagram

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. He connected an old LED strip

The UC3842 needs a startup voltage. A few high-value resistors (two 150kΩ in series) trickle-charge a small capacitor (C6, 47µF/50V) until the chip wakes up. Once awake, the chip sends square waves to the MOSFET’s gate via a small resistor (e.g., 22Ω) and a fast diode. A tiny 8-pin chip: the

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.”