Sunday, July 7, 2013

Low Ripple Regulated Power Supply

This circuit may be used where a high current is required with a low ripple voltage (such as in a high powered class AB amplifier when high quality reproduction is necessary ).
Low Ripple Power Supply Circuit Diagram
PARTS LIST
R12.2KΩ 1W
R256Ω 1W
R31oKΩ 1W
C11000µF 63V
C2100µF 50V
C3470µF 50V
D1, D2, D3, D46A Bridge Rectifier
D5500mA Zener Diode (see description)
Q12N3055
Q22N3054
Q1, Q2, and R2 may be regarded as a power darlington transistor. D5 and R1 provide a reference voltage at the base of Q1. D5 should be chosen thus:
D5=Vout-1.2
C2 can be chosen for the degree of smoothness as its value is effectively multiplied by the combined gains of Q1/Q2, if 100µF is chosen for C2, assuming minimum hef for Q1 and Q2,
C=100×15(Q1)×25(Q2)
=37000µF.

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