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Power Supply circuits diagram electronics projects

Power Supply circuits diagram electronics projects: battery chargers, switching power supply , ac power supply, dc dc converters, power inverter, converters and power adapters .

Voltage reference using FAN5358

A very simple voltage reference electronic project can be designed using the FAN5358 IC which is an small 2MHz , 500mA Synchronous Buck Regulator ,manufactured by Fairchild Semiconductor .
This voltage reference regulator project will provide a fixed output voltage from 1 volt , up to 1.8 volts , depending on selected IC .

As you can see in the presented circuit diagram , this voltage reference IC require just three electronic components . Maybe you will ask : Why to use it for and not use a zenner diode or something else ( more cheap ) .
In some situations you’ll need a high precision , small and constant output voltage . In plus of that , the FAN5358 voltage regulator has many other features like : low ripple , internal soft-start, input under-voltage lockout , thermal shutdown and overload protections .
However the FAN5350 reference IC operate from an input voltage range of 2.7 volt to 5.5 volts .

Values for C1in and Cout must be 2.2u respective 2.7uF and value for L1 is 2.2uH.
fan5358 voltage reference schematic circuit

NCL30100 115 Vac Converter

This power supply electronic project is an very simple 115 Vac Converter, designed using the NCL30100 compact switching regulator controller designed for high brightness LED driver applications where efficiency and small size are very important.
The input voltage range is from 85 to 140 Vac and is rectified by bridge rectifier D1, D3, D4 and D6. C1 capacitor is used to limit current peaks generated during on time period. CX1, C2 and L1 are an EMI filter to protect mains against current spikes mainly generated by D2 if Q1 is turned on. The NCL30100 is powered through resistors R1 and R2.

The Vcc voltage is limited by D7and the maximum LED current is set by resistors R3, R4 and R5 (in this case Rsense is 0.33 Ω to reach higher accuracy). C3 capacitor is used to filter out spikes which are generated during the turn off of diode D2. It is recommended to use L2 with low series resistance since current is flowing through the inductor continuously and D2 should be selected for low forward voltage drop and fast reverse recovery time.

The main important features of this converter electronic circuit project , based on the NCL30100 compact switching regulator controller are : input voltage: Vin 115 Vac , nominal LED current: 700 mA (rms) , LED ripple: 120 mA (peak to peak) , VLED: 3.2 V , freewheel diode Vf: 0.5 V, target switching frequency: 50 kHz , dimming using PWM signal 1 kHz with duty cycle 0 – 99% .
NCL30100 115Vac converter designed for high brightness LED

Amplifier power supply

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 .
audio amplifier power supply schematic circuit

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