Browse over 10,000 Electronics Projects using the Page Numbering provided at the bottom of each Page.

Low voltage power supply unit

Low voltage power supply unit
In this post we introduce simple and flexible, regulated low voltage power supply unit. This power supply has provision for 4 outputs such as 1.5V, 1.8V, 2.5V and 3.3V. We mainly build this low voltage power supply unit to test (and power-up) low voltage MCUs, CPLDs and radio receivers. For this power supply we choose 1.8V, 2.5V and 3.3V to get it compatible with most of the LVTTL/LVCMOS devices. Other than that, we include 1.5V because there are several analog ICs are available for that voltage level.

This power supply unit is based on LM1117/AMS1117 voltage regulator series and for this design we use AMS1117-1.5, AMS111-1.8, AMS1117-2.5 and AMS1117-3.3 fixed voltage regulators. Except to above regulators this board can be use with AMS1117-2.85 and AMS1117-5.0 regulators.

Internal view of low voltage power supply unit.

In our prototype we use center-tapped 6V (1A) step down transformer with this power supply unit. All the wiring diagrams to transformer and rotary switch are provided with the schematic.

The given PCB design for this power supply unit is based on SOT-223 (SMD) version of voltage regulators. Even though it use SMD components this PCB can build with single side PCB. Dimension of the PCB is set to 89mm × 69mm. All PCB designs and schematics of this power supply unit are available to download at elect.wikispaces.com.

 

More Articles to Read

avatar
EEWeb
avatar
Dangerous Prototypes
avatar
EEWeb
avatar
Arduino Blog
avatar
Arduino Blog
avatar
Ken Shirrif
avatar
Dangerous Prototypes
avatar
EEWeb
avatar
Arduino Blog
avatar
Freetronics
avatar
Arduino Blog
avatar
Dangerous Prototypes

Top




Shares