Adjustable-Linear-DC-Power-Supply-PCB-Design-
Honyar55
A compact, 2-layer PCB implementation of an adjustable linear voltage regulator using an LM358 operational amplifier and a BD139 NPN pass transistor.This circuit takes a DC input voltage (e.g., $+15\text{V}$) and provides a smooth, adjustable output regulated by a reference Zener diode and negative feedback loop. Designed and routed using KiCad 8.0
Components (9)
| Reference | Value | Description |
|---|---|---|
| Q1 | BD139 | 1.5A Ic, 80V Vce, Low Voltage Transistor, TO-126 |
| U1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 |
| C1 | 100uF | Polarized capacitor |
| C2 | 10uF | Polarized capacitor |
| D1 | 1N47xxA | 1300mW Silicon planar power Zener diodes, DO-41 |
| J1,J2 | Screw_Terminal_01x02 | Generic screw terminal, single row, 01x02, script generated (kicad-library-utils/schlib/autogen/connector/) |
| R2 | 1k | Resistor |
| R3 | 220 | Resistor |
| RV1 | 10k | Potentiometer for Simulation |