Based on technical discussions and teardowns at the EEVblog Forum and Scribd , key parts include:
: To minimize heat dissipation across the pass transistors, the circuit uses relays that switch between different transformer taps at specific voltage thresholds (e.g., 8V, 16V, and 24V). Yh-305d Power Supply Schematic
follows a classic linear regulation design. It typically utilizes a large to step down the AC mains voltage, which is then passed through a bridge rectifier and large filter capacitors to create a raw DC voltage. Based on technical discussions and teardowns at the
: Fixing "dry" or intermittent solder joints that can cause the supply to fail or output incorrect voltages. Be aware: Yihua YH-305D bench PSU - EEVblog : Fixing "dry" or intermittent solder joints that
: Swapping the factory BJT switches in the current sense circuit for MOSFETs like the 2N7000 for better linearity.
: A low-resistance shunt resistor is used to measure current, with adjustment trimmers (like VR10 for offset and VR11 for gain) allowing for calibration.