Schematic Diagrams

Useful schematic and wiring diagrams. ✔ ✔ Enjoy electronic circuits, let your idea comes to hardware


Step-Down Charge Pump Regulator for USB Powered Devices

this is a circuit of Step-Down Charge Pump Regulator for USB Powered Devices. The critical design parameter of this circuit is the circuit area. To solve this problem we can use Charge pump step-down circuit. This circuit only requires   the charge pump controller and  four ceramic capacitors. So it is a low cost circuit because […]

Power Factor Controller

This circuit is called power factor controller with universal input circuit. It has input range about 90 to 268Vac. Any standards of mains supply  in almost any country would be under that range. Maximum load of this power factor controller is 450W. The circuit shown  by the schematic diagram below : This is a simple […]

Constant Current Constant Voltage Switching Power Supply

This is a circuit that produces constant current constant voltage  SMPS. To efficiently charge a battery, we can use constant current constant voltage  SMPS. This circuit produces 600 mA at constant current mode and 7.2V at constant voltage mode. Here is the circuit: The operation of this circuit is simple, When the load impedance is […]

28V DC To 5V DC Switch-Mode Converter (Regulator)

This is a 28VDC to 5VDC switching converter circuit.  As a switch-mode voltage regulator, this circuit gives higher efficiency than linear regulator type. Using the National Semiconductor LM1575-5.0, this circuit can be used to convert 28VDC To 5VDC with efficiency of >80%. This circuit can be used as a 5V source @ 1A. Here is […]

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High Efficiency Switch Mode 3.3A 10A Regulator

This switch mode regulator circuit has higher current output than  our previous switch mode regulator, but it uses same controller IC. Up to 10A can be served by this switch mode regulator. The output of this regulator circuit is regulated at 3.3 volt, and the input range is 4-9Volt. The SHDN pin can be pulled […]


High Efficiency Switch Mode 3.3V 5A Step-Down Converter

This switch mode step-down converter has very good efficiency, up to 94% can be obtained. This switch mode regulator uses LTC1266-3.3 controller with external N-Channel power mosfet, and need only a 5uH inductor because it uses high frequency switching. Here is the schematic diagram of this switch mode step down converter circuit: To optimize efficiency, […]


Transformerless, Switch Mode Boost Regulator, A Step-Up Converter

Using this switch mode regulator circuit, you can get a stable 12 volt output (500mA) although you just have 4,3 – 10V power supply. You can even boost a 3.5V input to 12V if the load draws only 100 mA or less. This switch mode voltage regulator use LTC1266 IC chip from Linear Technology. Here […]


Constant Current Constant Voltage SMPS (Switch Mode Power Supply)

This constant current constant voltage  SMPS can be used to efficiently charge a battery. This circuit gives 7.2V at constant voltage mode, and 600 mA at constant current mode. Here is the schematic diagram of the circuit: The mechanism is simple, when the load impedance is high, then the output voltage will be constant at […]

52W SMPS AC-DC Adapter

This SMPS AC-DC converter gives good efficiency. Test data shows efficiency of 83.2% at 115 Vac input and 6A output current, and 85.4% at 230 Vac input and 6A output current. Moreover, the input voltage range is universal, accommodating 92 to 276 Vac variation with only 24 mV change in the output voltage. Here is […]

Miniature Voltage Isolation Provides Positive and Negative Supply

The development of miniature low-power (<2-W) DC/DC converters is growing rapidly because of the hot growth in distributed-power architecture. This application minimize the converter’s impact onboard space. This device is very useful for safety-critical applications such as medical equipment, and telecommunications, and industrial applications because it provides point-of-use isolated power conversion for analog circuitry. In […]


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