All posts in the 'Power supply' Category
Posted on 30 Jul 2008
If you need a power supply that can deliver high currents to give a couple of example of possible uses; power source for an 12V car amp, cheap alternative for replacing your broken WLAN access point, flatbed scanner, printer, LCD monitor, or whatever -transformer. Or as in my case: a lab power supply.Consider converting one from an old PC.[more]
Posted on 03 Jul 2008
The schematics for this DC/DC converter is built around the UC3843 generic, low cost PWM controller. This very common PWM controller generate a duty-cycle modulated square wave ranging from 0 to 100%, at a user fixed frequency of 100KHz.Here are some features:
-Input voltage from 10V to 18V
-Output voltage from 20V to 28V adjustable
-Output current up to 5A for 3300mAh battery packs fast charge.
-Compact dimension (80×60mm)
-No heat sink or fan coolers even delivering up to 140W to the load.
[more]
Posted on 19 May 2008
This power supply module plugs straight into common bread boards, allowing you to cleanly and easily power your board with a wall wart plug or with wires into screw terminals. It features a variable voltage regulator that can be set to output 3.3 or 5V with a jumper, or any voltage if a potentiometer is added. The input has a rectifier that accepts AC or DC [more]
Posted on 18 May 2008
Simple negative power supply (-5V / -12V / -15V)
Sometimes you need a simple negative power supply. The best example is the contrast PSU for common small LCD device. Building -5V from a battery or a wallmart supply isn’t really easy.Here is a simple design small device that is able to provide -5V, -12V, -15V. He used the MAX 764/765/766 series.[more]
Posted on 03 Apr 2008
Zigbee, formally IEEE 802.15.4, is another short-range radio standard that uses the 2.4 GHz “microwave oven” band, alongside wireless Ethernet and Bluetooth. Compared to these others, Zigbee is most suited for low-power applications involving simple microcontrollers, for example wireless sensing, home and industrial automation, and so on. Its basic parameters are a data rate of up to 250 kbits/s and a typical range of 50 m.A small Linux box like the NSLU2 (aka Slug: 266 MHz XScale ARM processor, filesystem on a USB flash drive, takes about 5W, runs Debian GNU/Linux and other distributions) could be useful in a Zigbee deployment. For example, an always-on Slug could be responsible for logging data sent by remote sensors, and generating graphs on web pages, sending email alerts and so on.[more]
