Adjustable Breadboard Supply

July 16, 2009 by Eliot 12 Comments

breadboardpowersupply

adafruit industries’ latest product is an adjustable breadboard power supply kit. We’ve seen breadboard supplies before, but like most of adafruit’s kits, this is the best design you’re going to encounter. It uses an MIC2941 voltage regulator instead of the more commonplace LM317. It has a very low dropout which means your output voltage can be much closer to the input voltage. Their example is using 3AAA or a Li-Ion battery for an output of 3.3V. Input can be through a barrel jack or terminal blocks. There is a selection switch for 3.3, 5, and adjustable voltage. Using the adjustment pot you can select an output voltage anywhere from 1.3V to within .5V of the 20V maximum input. The adjusted output voltage will remain the same even if you increase the input voltage. Like all of their kits, you can find schematics, assembly and usage instructions, on their project site.

Compaq Motherboard Power Mod

July 9, 2009 by Caleb Kraft 16 Comments

cpq2atx_brd2

Some companies insist on using proprietary pieces. It can be really frustrating when there is no apparent reason other than consumer lock in. It irritates us to feel like we’re being forced to buy their pieces. This is one of the more popular reasons listed when you ask a hacker or modder what got them started. This project takes us through making a normal power supply work with the compaq proprietary 14 pin plug found in some smaller desktop PCs.

Aside from the plug itself being different, the motherboards require a 3.3v standby voltage. A normal power supply usually only has a 5v. Though there are even simpler ways of bypassing the issue, he chose to put an inline voltage regulator. Schematics are available on the site.

[via Hacked Gadgets]

Hacking The MagSafe

March 18, 2009 by Caleb Kraft 27 Comments

magsafe
This is a simple hack that could come in handy one day. [Mooner] wanted to use a Kensington universal power supply with his Macbook Pro, but found the adapters and peripherals involved “hideous”. His solution was to wire directly to the Kensington power supply. It’s pretty simple really, only a couple resistors are needed. It’s nice to have someone else do the research for you sometimes. While his final picture does look neat and tidy, we just don’t know how much of an improvement he’s made to the aesthetics. What do you think?

Xbox 360 Jasper Motherboards

November 28, 2008 by Eliot 26 Comments

xbox360

The Xbox 360 has a brand new motherboard. Dubbed the Jasper, it presumably has a new 65nm process GPU. The new box has a 150W power supply instead of the former’s 175W brick. They’ve changed the plug design to prevent usage with old consoles. The most notable change is the onboard flash memory upgrade. Earlier consoles only had 16MB; new ones have 256MB. The majority of this storage will be used for the new dashboard, the NXE. The remaining space can be used for game saves. With the new storage, Arcade units are no longer including memory cards. You can see more images of the boards on Xbox-Scene.

Easy High Voltage Power Supply

November 10, 2008 by Eliot 16 Comments

hv_supply

[rocketman221] wrote up one of the simplest ways to build a high voltage power supply. This one in particular was used on his coilgun. Instead of building a custom circuit, he’s using flash charging boards from disposable cameras. Six 450V 470uF caps are wired in parallel to make up the bank. Two of the charger boards are wired to one switch to initiate the charging process. Four additional boards are wired two a second switch for the second charging stage. The part cost on this is incredibly cheap and it only requires a 3.3V input to reach 450V. The writeup has plenty of warnings about the dangers of high voltage; you need to clean off all flux residue to prevent arcing across the circuit boards. Embedded below is a video of the bank being discharged through several objects. Continue reading “Easy High Voltage Power Supply” →

Adjustable Breadboard Power Supply

November 8, 2008 by Eliot 14 Comments

psboard

This looks like a great addition to your breadboard. [Nerdz] wanted a power supply that was easily portable and adjustable. He built a custom board that plugs directly into the breadboard’s power rails. It has a pot attached to the ground of a 7805 voltage regulator so the output can be adjusted from 5V to just under the supply voltage. Anything that makes a breadboard less of a rats nest is definitely a good thing.

Switchmode Power Supply Hacking (power Your Laser)

July 27, 2007 by Will O'Brien 7 Comments

[Mike] wanted a better power supply for his argon laser, so he modded some switchmode power supplies. With a few tweaks, he had a few adjustable voltage outputs and a nice solid supply of electrons for his laser projects. If you need a lab quality adjustable power supply for your projects, this is a nice way to get it on the cheap. (He’s in the UK, but the same ideas should apply to us models.