Tag Archives: Power Supply

Prototyping board with built-in power supply

This prototyping board with built-in regulated power supplies was designed by Electro-Lab and consists of four independent DC-DC buck converters based on LM2675-ADJ and generates 3.3V, 5V, 12V and -12V at 1A.

DIY prototyping board with regulated power supplies

DIY prototyping board with regulated power supplies

Prototyping is a useful and powerful method in electronics which lets us analyze a circuit before using it in a system or turning it into a product. In this process we may need a single supply or multiple supplies to power the circuit depending on the type of the application. For example, an op-amp circuit may need a symmetrical supply such as +12V and -12V or a logic circuit may require both 5V and 3.3V at the same time. Some applications may need three or more. This means we should have a bench supply with multiple outputs or multiple bench supplies in the environment. This may not be always possible. This DIY Prototyping Board is designed to provide all the most used supply voltages that a designer will need during prototyping a circuit. The switching power supplies on the board output 3.3V, 5V, 12V and -12V rated at 1A independently. In addition those there are two precise voltage references at 5V and 2.5V provided especially for op-amp based applications.

Open source, modular bench power supply

Here’s a neat bench power supply design from a Hackaday user which offers very interesting features such as software calibration, programmatic control via USB Raw HID, etc at an affordable price. While this is still an ongoing project, the author defines his final goals of this project as:

  • Modular power supply from 1 to 6 channels (I am planning on having 4: 3x positive, 1x negative)
  • Each channel can independently be set from 0-12V (for positive channels) or -12-0V (for negative channels), and the output can go all the way to 0.
  • Configurable set points for voltage and max current for each channel
  • Actual readings for voltage and current for each channel
  • Low cost – it’s not as cheap as scrapping an ATX power supply (which is what I am using today), but the extra features such as current limiting should more than make up the extra cost.
  • Active (fan) cooling combined with heat sinks to support sustained high current loads
  • USB control (voltage and current set points), logging of actual voltage / current readings, and computer-based calibration.
  • The ability to use potentiometers for voltage / current set points instead of a microcontroller, if desired (each channel has four analog I/Os: Voltage and Current setpoints, and Voltage and Current sense outputs. All of these are in the range of 0-5V, allowing easy control from either a potentiometer or a DAC.
Bench power supply

Bench power supply

Revised dual power supply boards are back in stock

We have added a 500mA PTC fuse to our dual (5.0V/3.3V) power supply regular board in the new version. This power supply regulator board provides constant 3.3V and 5.0V outputs from an unregulated DC input (6.5-10V). The DC outputs are accessible through a 3-pin terminal block. It is small in size (1.9″X1.0″) and can be easily enclosed inside a project box along with the project circuit board.

New version has PTC fuse

New version has PTC fuse

The board doesn’t have any ON/OFF switch, because it may not be useful if this board is enclosed inside the project box. We have included two through-hole pads on the board if you want to add an ON/OFF switch externally. There are two surface mount pads which are shorted by default with solder to close the circuit permanently. They must be de-soldered if an external ON/OFF switch has to be added.

Buy Dual Power Supply Board for only $6.99

Multi-purpose dual power supply (5.0V and 3.3V) regulator board

All embedded systems require electric power to operate. Most of the electronic components inside them, including the processors, can operate at a wide range of supply voltage. For example, the operating voltage range for the PIC16F1847 microcontroller is 2 to 5.5 V. But there are certain applications where you need a regulated constant voltage to avoid malfunctioning of the circuit or getting erroneous results. For instance, any application that involves analog-to-digital conversion (ADC) requires a fixed reference voltage to provide accurate digital count for input analog signal. If the reference voltage is not stable, the ADC output is meaningless. Here is my latest dual power supply regulator board that provides constant 3.3V and 5.0V outputs from an unregulated DC input (6.5-10V). It is small in size and can be easily enclosed inside the project box along with a project circuit board. It can also be used to power test circuits on breadboard. The board uses two AMS1117 series fixed voltage regulators and receives input power through a DC wall wart or an external 9V battery.

Dual power supply regulator board

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