Quieting an inexpensive bench power supply

March 29, 2012 By Leave a Comment

[Mike] just purchased this Atten APS3005S bench power supply for around $80. It does the job, but boy is it noisy! We were pretty surprised to hear it fire up in the video after the break. To make matters worse, the noise is persistent since the fan never shuts off. Having worked with other bench supplies he knew that a common feature included in many models is temperature controlled case fans. He set out to quiet the fan and implement a temperature switch.

For this project [Mike] had the benefit of looking at a nearly identical model that does have temperature switching. He discovered that the board on this one has a through-hole zero ohm resistor populated in place of a thermostat switch. That switch closes the connection at or above 45 degree Celsius, thereby turning on the cooling fan. Bridging the traces with a zero ohm resistor to save on production costs is what caused the fan to run continuously. After replacing the resistor with a KSD-01F and swapping out the stock fan for a high-quality version [Mike] has takes a noise maker and turned it into a device that’s kind to the ears.

[Read more…]

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Turning a rotary tool into a PCB drill press

March 26, 2012 By Leave a Comment

Drilling holes in PCBs is nearly always an exercise in compromise; the holes are small, precision is paramount, and the common solutions, such as a Dremel drill press, aren’t of the highest quality. In a quest to find the best way to drill holes in PCBs, [reboots] even went so far as to get a pneumatic dental drill, but nothing short of a high-quality micro drill press would do. Not wanting to spend hundreds of dollars to drill a few holes, [reboots] did the sensible thing and made one from scratch.

[reboots] ended up buying a Proxxon Micromot 50 after reading the consistently good reviews around the Internet. To use this rotary tool as a drill press required more work, though. Two precision steel rods from a dot matrix printer were salvaged and pieces of aluminum C-channel and small bearings were bolted together into a very high-precision drill press. Only hand tools were used to build this drill press, and the results are amazing.

[reboots] was originally inspired to check out Proxxon tools from one of Hack a Day’s rare tool reviews. The Proxxon TBM115/220 earned the skull ‘n wrenches seal of approval (and found its way into other Hack a Day-ers labs), but sometimes a few hundred dollars is too much of an investment for something only used occasionally. Considering [reboots]’ scrap aluminum drill press is a better tool than the sloppy consumer rotary tool presses, we’ll call this a success.

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Noise Reduction Techniques for Your Shop-Vac

March 21, 2012 By Leave a Comment

shop vac noise-reduction setup

Shop-Vacs are great tools, but they do have the notable disadvantage of being loud.  Fortunately, much of the noise emanates from the exhaust, and with a muffler or “silencer”, this can be controlled. The results of my noise-recustion experiments were noticeable, reducing the noise by roughly 5.6 decibels. This may not sound like a huge improvement, but since the scale is logarithmic the sound intensity is actually cut by roughly two-thirds, according to this calculator.

As for how to actually make the muffler, I’ve outlined everything in this post.  As of now, the Shop-Vac muffler is used in a static configuration, but with some changes it could be used on a mobile vacuum.  The disadvantage of this reduction in noise is a slight reduction in suction, but it seems to be an acceptable trade-off in this situation – used for a little CNC router with this adapter.

For a video of the Shop-Vac in action with the CNC router in question, check out the video after the break.  Note that this is pre-silencer, so you can definitely hear the vacuum noise! [Read more…]

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A better dust skirt for your CNC mill

March 14, 2012 By Leave a Comment

[Joshendy] wanted to get a better look at the cutting head on his CNC mill when it was running. The problem is that the rotating blades throw up a lot of junk which you don’t want flying around the shop so they’re usually surrounded with a shroud connected to a shopvac. He just milled is own transparent dust skirt to solve the problem.

The original dust skirt uses black bristle brushes to contain the waste from the cut. In addition to obscuring your view of the cutter this didn’t do a very good job of containing bits and pieces. The solution seen on the right uses clear, flexible PVC as the skirt. The video after the break details the build process. [Joshendy] cut out a replacement plate which is then fitted with magnets to connect to the cutter. The skirt is affixed to that plate with a series of screws, making it easy to replace if it ever wears out.

[Read more…]

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ecDB offers a simple, intuitive way to keep your electronic inventory organized

March 12, 2012 By Leave a Comment

ecdb

One of the most important tools for any hacker or maker is organization. You might consider it more of a concept rather than a physical tool, but regardless of how you like to frame it, ensuring your tools and components are (nearly) always where they should be is key. As the odds and ends add up, it can sometimes be hard remembering exactly what you have on hand – that’s where the ecDB comes in handy.

Short for electronics component DataBase, the ecDB was created by [Nils Fredriksson], and offers a clean and intuitive way to keep tabs on what you have in-house. Many of us have used spreadsheets and notebooks to do the same, but ecDB allows you to record much more data than you could with either solution.

This is immediately clear within a moment or two of looking at the site’s interface. Not simply limited to listing part names and quantities, ecDB allows you to record manufacturer info, package type, and pin counts, while also allowing you to attach PDF datasheets and images of your components as well.

We really like system that [Nils] put together, and suggest giving it a spin to see if it will help you keep things organized in your workshop.

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Adding a laser sight to your drill press in just a few easy steps

March 10, 2012 By Leave a Comment

drill-press-laser-sight

[Derek] was using his Dremel drill press to prep a bunch of PCBs, and found that it was getting difficult to focus on the spinning drill bit each time to line it up with the solder pads on the boards. He figured that a laser sight would help move the process along, but since no off the shelf solution was available for his press, he built one of his own.

He bought a cheap desk lamp with a flexible metal neck, which he disassembled, saving the flexible metal sheath. He installed a conduit clamp on one end of the neck, and a laser module at the other. [Derek] then mounted the laser arm on the press’ crow’s nest aiming it at the tip of the drill bit.

As you can see in the video below, the ability to easily position the drill bit using the laser helps him make quick work of any PCB.

[Read more…]

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