Full-Wave Bridge Rectifier: Design, Benefits, and Practical Implementation

Parts and Materials

• Low‑voltage AC supply (6 V RMS)
• Four 1N4001 rectifier diodes (Radio Shack catalog #276‑1101)
• Small permanent‑magnet hobby motor (Radio Shack catalog #273‑223 or equivalent)

Cross‑References

Lessons In Electric Circuits, Volume 3, Chapter 3: “Diodes and Rectifiers”

Learning Objectives

• Design a full‑wave bridge rectifier circuit
• Compare the bridge rectifier’s advantages and disadvantages with the center‑tap (split‑phase) configuration

Schematic Diagram

Illustration

Instructions

This configuration delivers full‑wave rectification without a center‑tapped transformer, making it ideal when a split‑phase source is unavailable. Compared to a center‑tap bridge, the full‑wave design uses four diodes and introduces an additional voltage drop—each half‑cycle requires current to pass through two diodes instead of one—resulting in a slightly lower DC output. With a 6 V RMS supply, this drop is noticeable; compare the DC voltage across the motor terminals here with the voltage measured in the previous center‑tap experiment using the same supply and motor.

Computer Simulation

SPICE schematic (node numbers shown):

Netlist (copy the following into a text file and run in your SPICE tool):

Fullwave bridge rectifier v1 1 0 sin(0 8.485 60 0 0) rload 2 3 10k d1 3 1 mod1 d2 1 2 mod1 d3 3 0 mod1 d4 0 2 mod1 .model mod1 d .tran .5m 25m .plot tran v(1,0) v(2,3) .end

Related Worksheets

• Full‑Wave Bridge Rectifier Worksheet
• Rectifier Circuits Worksheet