1N4007 Full Bridge Rectifier

Application

This circuit turns a 12 V, 60 Hz AC input into a pulsed DC rail using a four-diode bridge, then smooths that rail with a reservoir capacitor feeding a 1 KOhm load. It is a compact example of the front end used in many low-voltage DC power supplies.

Design Context

D1 through D4 form the bridge rectifier. On each half cycle, two diodes conduct and steer current so the load sees the same output polarity. C1 charges near the AC peaks and supplies the load between peaks, while RLOAD sets the discharge current and ripple level.

Expected Behavior

Vin alternates above and below the input reference. Vout stays positive after the bridge and rises toward the AC peaks minus two diode drops. Between peaks, C1 discharges into RLOAD, so Vout shows ripple instead of returning to zero. Iload follows the smoothed output voltage through the 1 KOhm load.

Suggested Applications

• AC adapter and transformer secondary rectifier stages.
• Unregulated DC rails before a linear regulator.
• Diode bridge polarity-steering examples for power electronics education.

Suggested Experiments

• Increase C1 to reduce output ripple.
• Decrease RLOAD to increase load current and make the ripple larger.
• Change the AC amplitude or frequency to see how source conditions affect the DC rail.

Featured Component

The 1N4007 is a silicon rectifier diode rated for high reverse voltage service. In this bridge, four 1N4007 diodes share the rectification function so both AC half cycles contribute to the positive DC output rail.