Are you looking for a portable breadboard power supply with a selectable voltage? Also thinking about how long the batteries will last? This project utilizes one or two AA/AAA batteries to generate a preselected voltage of 5V or 3.3V, and squeezes the batteries untill they have almost no power at all. AASaver is based on the Microchip MCP1640 boost converter. [via]
When your electronic devices report that the batteries are ‘dead’ and need to be replaced, do you ever feel frustrated that there is often still a lot of juice in them? Don’t throw away the batteries yet! You can use the remaining energy to do a lot of things, such as powering LED flashlights. This is possible by using a boost converter, which can bump the low battery voltage to a higher voltage, enough to light up LEDs or even power breadboard circuits.
Squeeze the power out of batteries using AASaver – [Link]
AS with many tinkerers and junk electronics collectors, a variety of “acquired” power supplies wind up on the author’s shelves to await attention. But are they worth keeping? Testing them with a resistive load is messy and difficult, and with high current supplies it is nearly impossible, unless you have a carbon pile! The tester whose circuit diagram is shown in Fig controls supply currents to 20A, and voltages from 1·7V to over 50V. Current control is so stable that once the current is set, a supply voltage can be varied across this range and the current will remain constant. Maximum power will depend upon how well the pass transistors utilize heatsinks.
Power Supply Tester circuit – [Link]
This is a standard bench power supply for prototyping electronic circuits.
Its main feature is a selection of outputs at standard fixed voltages used in electronics. Because the outputs are fixed you do not have to worry if the voltage is correct, you just plug the wire in. It is quick and easy to use.
You will probably still need a conventional variable power supply to test circuits over a range of voltages – but this is the one that you will use for day-to-day development.
It features four fixed outputs with an overall 1 amp capacity:
+5V and +3.3V
+9V or +12V or +15V
-9V or -12V or -15V
Standard bench power supply – [Link]
Check out this video by Giorgos Lazaridis, in which he dissects a cheap digicam power supply from eBay and finds some surprising things inside, including some very questionable inductors. [via]
Fraudulent Electronics Exposed – [Link]
The LTM®4600 is a complete 10A switchmode step-down power supply with a built-in inductor, supporting power components and compensation circuitry. With high integration and synchronous current mode operation, this DC/DC µModuleTM delivers high power at high efficiency in a tiny and low profile surface mount package. Supported by Linear Technology’s rigorous testing and high reliability processes, the LTM4600 simplifies the design and layout of your next power supply.
- 15mm x 15mm x 2.8mm LGA with 15°C/W θJA
- Pb-Free (e4), RoHS Compliant
- Only CBULK Required
- Standard and High Voltage:
* LTM4600EV: 4.5V<=VIN<=20V
* LTM4600HVEV: 4.5V<=VIN<=28V
- IOUT: 10A DC, 14A Peak
- Parallel Two µModules for 20A Output
LTM4600 – 10A switchmode step-down power supply with a built-in inductor – [Link]
How-To: Variable DC Power Supply @ MAKE – [via]
Hobbyist electronics projects need robust, reliable power supplies for prototyping and testing. I learned how to build this circuit from the Basic Analog Circuits class at ITP taught by Eric Rosenthal, but took it several steps further in building a solid enclosure and integrating a voltage meter. Now it lives on my desk, ready to power most small projects I’m working on, ranging from 0 – 24 volts and up to two amps. You can learn all about how to make one yourself using this Make: Projects tutorial.
The mini volt meter from Adafruit is what brought this project to the next level. All of the components on this three-digit, seven-segment display are packaged into a small size. All you need to do to integrate it into any project is attach a positive and negative lead to whatever you wish to measure.
Make a variable DC power supply – [Link]
Aktakom offers essential laboratory package complete with oscilloscope, signal generator, power supply and 6 in 1 digital multimeter.
Miami Fl., October 11, 2011, 2011 – T&M Atlantic, distributor of the test and measurement equipment today announced a package deal that combines all the basic equipment necessary for assembling a new electronics laboratory. The laboratory package includes: Aktakom ADS-2061M (60MHz; 500MS/s; 2ch) Digital Storage Oscilloscope, Aktakom AWG-4105 (5MHz; 125 MS/s; Wave length: 16 K pts.; 2ch) Function / Arbitrary Waveform Generator, Aktakom APS-3205 ( 30V:5A; 2ch) Power Supply and Aktakom AMM-1062 6 in 1 Professional Digital Multimeter with Environment Measurements (Light Meter, Sound Meter, Humidity Meter, Temperature Meter & Non-contact AC voltage detector). This laboratory package is not just functional and economical it is also portable and with optional VGA output for an oscilloscope could be used for presentations, demonstrations and brainstorm sessions.
First introduced at the NCSL International Show in Washington DC, ADS Oscilloscopes and AWG Generators attracted interest from many leading laboratories including: MIT, John Hopkins University, UMASS, UPENN and UCA Berkley.
More information is available at www.tmatlantic.com
Introductory Prices start from $999.00 Plus Free Shipping and Free Oscilloscope Carry Bag
Aktakom electronics laboratory under $1000 – [Link]
This is a a regulated power power supply that is sized to plug right into the power bus strips of common solderless breadboards.
The board is assembled except for the headers which you must provide separately and solder in place.
Breadboard Power Supply Stick 5V/3.3V – [Link]
This project is like the one that all of you must have done in electronics. I took the idea from Circuit Cellar. The original power supply provides an output of 2.5-15V at 500mA. This circuit will provide 0-25V at 0 to 5A. You will see there is a lot of modification to achieve this.
Bench Power Supply 0-25v @ 0-5amp – [Link]