Adjustable Output DC-DC Power Supply with Ultra-Wide Input and 3A Output


The pt1-OKI78SRE-5V-3V3 is a robust and stable power module providing four 3.3V outputs and another 5.0V outputs for each of the two voltages at a maximum of 1.5A. The board is built around two of Murata’s fixed-output DC-DC switching (buck) regulators from the OKI-78SR series, which provide far higher efficiency than any linear power regulator and thus do not require heat sinks.

The input voltage can be anywhere between 7V and 36V, supplied through the screw connector or the barrel jack connector.

Both power circuits feature their fuse (protecting the circuits against sustained input reversal) and an indicator LED. The power outputs are protected against short circuits and over-temperature. The converters will automatically restart once the short circuit condition is removed.

0.75-4.5V Adjustable Output DC-DC Power Supply, 9-32V Ultra-Wide Input, 3A Output

The pt1-OKIT3W32-4V5max is a robust and stable power supply providing four outputs, adjustable from 0.75V to 4.5V, at a maximum of 3A. The board is built around a Murata OKI-T/3-W32 DC-DC switching (buck) converter, which does not require a heat sink. The input voltage can be anywhere between 9V and 32V, supplied through the screw connector or the barrel jack connector.

The module features an onboard fuse, protecting the circuit against sustained input reversal. The power output is also protected against short circuits and over temperature. The converter will automatically restart after the short circuit condition is removed. The circuit has added some translator logic to provide a (positive) logic ENABLE signal (e.g., 3.3/5V).


  • 9-32V ultra-wide input, power provided through screw or barrel jack connector
  • four outputs, adjustable from 0.75v to 4.5V, at a maximum of 3A in total
  • built around Murata OKI-T/3-W32 DC-DC switching (buck) converter
  • very high efficiency, not requiring any heat sinks
  • protected against sustained input reversal through an onboard fuse
  • protected against short circuits and over-temperature
  • automatic restart after a short circuit
  • (positive) logic ENABLE signal (e.g., 3.3/5V)
  • all based on robust through-hole components (except for the OKI-T/3-W3 converter)
  • the board is standing on four brass standoffs, allowing you to place it on a working table or integrate it into a larger assembly
  • board size: 52.75×34.00mm; bolts: 46.75×28.00mm (M2.5)
  • high-quality PCBs designed in KiCad and produced by Aisler (Germany), PCBWay (China), and OSH Park (USA)
  • the board comes fully assembled and tested
  • power cables available

NOTE: the total output voltage range runs from about 0.75V to 4.5V; if you need a more limited range (to protect the hardware you will be connecting to this module), select one of the other (more restricted) ranges

NOTE: the module requires a different fuse depending on the input voltage (2A for ~12V input, 1A for ~24V input); make sure you select the suitable module for your application

NOTE: the module will only start when a high logic ENABLE signal is provided; if you need a module that is always on, select the type without the ENABLE signal logic


I’ve created this board as a low-voltage power supply for my LED applications (often based on the TI TLC5947 constant current LED driver) and to feed the filaments of the VFD display tubes I use in my projects.

Additional information


2 pcs power cords, 4 pcs power cords, no additional options


~12V input voltage, ~24V input voltage


ENABLE signal, no ENABLE signal (always-on)


~1.5-4.0V (full range) output

Product Datasheet and Manual

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Adrian Offerman has an M.Sc. degree in computer engineering from Delft University of Technology, where he specialized in computer architecture and digital techniques and was trained as a processor designer. Furthermore, in 2010, he completed an M.Sc. degree in Psychology at Leiden University, where he specialized in cognitive psychology and clinical psychology.

Next to his technical writing, Adrian has been working as a consultant and engineer, advising on technology, business, markets, and innovation. Furthermore, he has worked as a Linux system manager, network manager, webmaster, software developer and architect, and technology advisor. He also had a web hosting company specializing in more complex, non-commodity services for almost ten years.

Offerman Industries is his latest undertaking in engineering, creating art and design based on old-school electronics.

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