This amplifier power supply is very useful in many power audio amplifier circuits where is needed an very good filtered and high efficiency power supply . This amplifier power supply circuit diagram presented here describes how to design a power supply circuit , very useful in many high fidelity power amplifiers ( this circuit can be used for LME49830 high-fidelity audio amplifier modules ).
The amplifier power supply is an unregulated design with an option to allow connection to either 120V or 240V mains. The design uses toroidal transformers, a fully integrated bridge, and various rail capacitors for ripple voltage reduction, noise suppression, and to act as high current reservoirs. Also additional circuitry to control inrush current on power up and power up/ down Mute control are also included.
C1, C2, C4 capacitors are used to protect against turn on/off spikes caused when the power switch changes positions. C3 is not used and is redundant.
CS1, CS2 capacitors are low value, ceramic capacitors to filter higher frequency noise right at the DC output of the diode bridge.
CS3, CS4 are the large reservoir capacitors to supply large current demands and stabilize the supply rails to minimize low frequency fluctuations.
CS5, CS6 are high quality film capacitors to filter higher frequency noise.
CS7, CS8 capacitors act in conjunction with RS1 and RS2 to decouple the large electrolytic capacitors and reduce impedance.
CS9, CS10 are low value, ceramic capacitors to filter higher frequency noise from the transformer secondary AC lines at the diode bridge.
CS11 - CS14 capacitors are in parallel with the bridge diodes to reduce high frequency noise and ringing of the diode. An additional RC snubber in parallel with each diode of the rectifier will further reduce noise and ringing.
Additionally, the supply rails have bleeder resistors, RBL1, RBL2, to drain the large reservoir capacitors (CS3, CS4).
As you can see , these power supply circuit has nothing special , but offers a high efficiency and stability , required in power audio amplifiers .