Feeds:
Posts
Comments

Archive for the ‘Power Supplies’ Category

Most modern small appliances that run on low voltage DC power will come with an ac adapter. You see them on phones, TV accessories, personal care products, computer peripherals, etc.

AC adapters

AC adapters

After many years of accumulating and discarding many of these devices some people like myself have managed to save a few of the ac adapters even though the device had worn out or became unusable for one reason or another. (more…)

Advertisements

Read Full Post »

The previous posts showed how to use an inexpensive voltage converter module to be able to get variable voltage from a fixed DC power supply. This post is one more variation and is the last build of these modules that I planned to do (build no. 3).

Step up step down DC buck converter module

Step up step down DC buck converter module

This unit is a step up step down DC buck converter module. The unit uses an LM2577S for boosting the voltage up and an LM2596S for stepping the voltage down. It has an input range of 3.5 – 28 volts and an output range of 1.25 – 26 volts. Both the input and output is rated at 1 amp stable and 3 amps maximum. (more…)

Read Full Post »

There are a lot of convenient and inexpensive ways to get get variable voltage from a fixed voltage DC power supply. The previous post detailed one way with an adjustable boost module. Many variations of these inexpensive modules are commercially available.

Step down DC buck converter adjustable voltage module

Step down DC buck converter adjustable voltage module

This post covers how to build a slightly different unit with an LM2596 step down DC buck converter module. The main difference with this unit and the adjustable boost module in the previous post is that this unit does not support increasing voltage. It is strictly for stepping down voltage. But I think it’s a good unit and definitely worth having in my toolbox. This post describes the steps on how to build it. (more…)

Read Full Post »

A quick and easy way to get variable voltage from a fixed voltage DC power supply is to use a commercially available adjustable voltage converter module. This is a convenient and inexpensive solution for powering electronics projects.

Adjustable Voltage Converter Module

Adjustable Voltage Converter Module

One of these modules can easily be connected to the output of a DC bench supply or even a salvaged AC adapter that may be lying around. Different modules are available for either stepping up or stepping down voltage. Some units also come with a built in voltmeter like the one pictured above. (more…)

Read Full Post »

This is a follow up post to the previous post on how to convert a computer ATX power supply to a shop DC supply. This article describes how to get more voltage combinations and goes into more detail on how to work with the unit.

DC bench supply made from computer ATX power supply

DC bench supply made from computer ATX power supply

When you convert a computer ATX power supply into a DC bench supply it can include up to 5 voltage outputs plus a ground. An ATX PSU (power supply unit) will always have four voltage rails — one each for +3.3 volts, +5 volts, +12 volts and -12 volts and sometimes there will be a fifth rail for -5 volts. (more…)

Read Full Post »

This post is the second in a series on how to convert an inexpensive computer ATX power supply unit (ATX PSU) into a useful tool for electronics projects or powering devices. The PSU case in previous article had vent holes on the back panel which put the binding posts in an odd arrangement. The vent holes on the back panel were a little different on this PSU case which allowed the binding posts to be arranged a little differently.

DC bench supply converted from inexpensive ATX power supply

DC bench supply converted from inexpensive ATX power supply

The project can probably be completed in a day or so and requires only a few basic tools like a power drill and a few other hand tools. It would be helpful to have an assortment of heat shrink tubing and a heat gun, plus a hot glue gun, a soldering gun, electrical tape, some solder and a few other electrical tools like wire cutters and a wire stripper. (more…)

Read Full Post »

This article is the first in the “Projects” category. It’s a very inexpensive way to make a pretty good DC bench supply or dedicated 12 volt supply for working on projects or powering devices. As of this writing, a good quality and powerful ATX PSU (power supply unit) can be obtained online for about $20.00 or less. With the addition of a few inexpensive electronic parts (binding posts, LEDs, resistors, and some bits of hardware) a person with moderate electronic skills can do this project.

ATX PSU converted to DC bench supply

ATX PSU converted to a DC bench supply

Below are links to some online articles and videos to use as examples done by other people. Most online references fall into two categories — converting an ATX PSU into a bench power supply or a dedicated 12 volt power supply. (more…)

Read Full Post »