Tiny Hotplate Isn’t Overkill

When working on a new project, it’s common to let feature creep set in and bloat the project. Or to over-design a project well beyond what it would need to accomplish its task. Over at Black Mesa Labs, their problem wasn’t with one of their projects, it was with one of their tools: their hot plate. For smaller projects, an 800W hot plate was wasteful in many ways: energy, space, and safety. Since a lot of their reflow solder jobs are on boards that are one square inch, they set out to solve this problem with a tiny hot plate.

The new hot plate is perfectly sized for the job. Including control circuitry, it’s around the size of a credit card. The hot plate is powered from a small surplus 20V 5A laptop power supply and does a nice 4 minute reflow profile and cools off completely in under a minute. Compared to their full-sized hot plate, this is approximately 29 minutes faster, not to mention the smaller workspace footprint that this provides. The entire setup cost about $20 from the heating element to the transistors and small circuit board, and assuming that you have an Arduino Pro sitting in your junk bin.

It’s a good idea to have a reflow oven or a hot plate at your disposal, especially if you plan to do any surface mount work. There are lots of options available, from re-purposed toaster ovens to other custom hot plates of a more standard size. Overkill isn’t always a bad thing!

Continue reading “Tiny Hotplate Isn’t Overkill”

Hacklet 99 – Soldering Tools

If there is one tool every hardware hacker needs, it’s a good soldering setup. Soldering irons, heat guns, reflow ovens and the like make up the tools of the trade for building electronic circuits. Spend enough time working with a tool, and you’ll find a way to improve it. It’s no surprise that hackers, makers, and engineers have been hacking their soldering tools for decades. This week’s Hacklet features some of the best soldering tool projects on Hackaday.io!

hakkoWe start with  [Kuro] a Hakko 907 based Soldering Station. Hakko 907 and 936 soldering station clones from the Far East are available all over the internet. While the heaters work, none of them have very good temperature controllers. [Kuro] turned a problem into a project by building his own soldering station. These irons are rated for 24 V. 24 volt power supplies are not very common, but it’s easy to find old 19 volt supplies from discarded laptops. [Kuro] found that the lower voltage works just fine. An Arduino nano controls the show, with user output displayed on a 2 line LCD. The finished controller works better than the original, and probably would give a real Hakko model a run for its money.

reflowNext up is [Sukasa] with Reflow Oven. When MakerSpace Nanaimo needed a reflow oven, [Sukasa] jumped in with this design. The idea was to create an oven that looked unmodified – just think of it as the toaster oven of the future, or the reflow oven of today. A Netduino plus 2 is the main controller. User information is displayed on a color TFT LCD. This oven is even internet connected, with an internally hosted web page and JSON data feed. The Netduino controls two beefy Solid State Relays (SSRs). The SSRs handle the dirty work of switching the oven’s heating elements. Two fans keep air moving to avoid hot spots. Precision temperature sensing is achieved through a pair of Adafruit MAX31855 breakout boards reading thermocouples.

plateNext we have [Jaromir Sukuba] with Soldering preheat plate. When soldering surface mount components, like QFN or BGA parts, it helps to pre-heat the whole board. There are commercial products to do this using hot air and other techniques, but it really comes down to making a hotplate. [Jaromir] figured he could do a pretty good job at this, so he built his own with a 3mm aluminum plate. Heat comes from 6 resistors in TO-220 cases. A Microchip PIC18 monitors a thermocouple and keeps things from getting too hot. For power, [Jaromir] had the same idea as [Kuro] did, and used a 19V power brick from an old laptop.

gooseFinally we have [Alex Rich] with Locking ball and socket gooseneck system. [Alex] came up with the Stickvise, so it’s fitting that he comes up with an awesome upgrade for it. We’ve all fought with “helping hands” while soldering. You never get them at quite the right angle. This system fixes that with a simple ball and gooseneck setup. [Alex] saw a similar design and printed it out. While it worked, the pieces popped apart too easily. [Alex] redesigned the system, adding a threaded locking ring. These new goosenecks stay put, holding your work exactly where you want it.

If you want to see more soldering tool projects, check out our brand new soldering tools list! If I missed your project, don’t be shy! Just drop me a message on Hackaday.io. That’s it for this week’s Hacklet. As always, see you next week. Same hack time, same hack channel, bringing you the best of Hackaday.io!

Solder at Room Temperature

Have you ever seen the science experiment (or magic trick?) where you get water supercooled to where it isn’t frozen, but then it freezes when you touch it, pour it, or otherwise disturb it? Apparently, ice crystals form around impurities or disturbances in the liquid and then “spread.” A similar effect can occur in metals where the molten metal cools in such a way that it stays melted even below the temperature that would usually cause it to melt.

[Martin Thuo] at Iowa University used this property to make solder joints at room temperature using Field’s metal (a combination of bismuth, indium, and tin). The key is a process that coats the molten metal with several nanolayers that protect it from solidifying until something disturbs the protective layer.

Continue reading “Solder at Room Temperature”

Heathkit’s Triumphant Return?

Heathkit, the storied purveyor of high-quality DIY electronics kits that inspired a generation of enthusiasts and launched the careers of many engineers, has returned from the dead. We think. At least it seems that way from this build log by [Spritle], an early adopter of the rebooted company’s first offering. But if [Spritle]’s experience is any indication, Heathkit has a long way to go to recreating its glory days. Continue reading “Heathkit’s Triumphant Return?”

AirAsia Crash Analysis: Who or What Failed?

Just a few days after Christmas last year AirAsia Flight 8051 traveling to Singapore tragically plummeted into the sea. Indonesia completed its investigation of the crash and just released the final report. Media coverage, especially in Asia is big. The stories are headlined by pilot error but,as technologists, there are lessons to be learned deeper in the report.

The Airbus A320 is a fly-by-wire system meaning there are no mechanical linkages between the pilots and the control surfaces. Everything is electronic and most of a flight is under automatic control. Unfortunately, this also means pilots don’t spend much time actually flying a plane, possibly less than a minute, according to one report.

Here’s the scenario laid out by the Indonesian report: A rudder travel limit computer system alarmed four times. The pilots cleared the alarms following normal procedures. After the fifth alarm, the plane rolled beyond 45 degrees, climbed rapidly, stalled, and fell.

Continue reading “AirAsia Crash Analysis: Who or What Failed?”

A Small, 1000W Induction Heater

[Proto G] built a small, desktop induction heater that is capable of making small castings, melting small amounts of metal, and functioning as one of the best solder pots we’ve ever seen.

The induction heater is built from a custom Zero Voltage Switching (ZVS) driver and powered by a small 48V, 1000W power supply. While this makes for an exceptionally small induction heater, it’s still very capable. In the video below, it only takes a few seconds to heat a screwdriver up to a temperature that will melt solder.

While an induction heating machine is essentially useless for irons unless you have a few antique, unpowered, blowtorch-powered soldering irons, it does make for a great solder pot. [Proto G] replaced the working coil in his induction heater with litz wire. The actual solder pot is made out of steel conduit wrapped with aerogel-infused fiberglass insulation. Compared to his old solder pot, this machine heats up instantly, and is more than capable of wetting a few wire connections.

The future plan for this inductive heater is to make a few more attachments for different metals, and a [Proto G] has a few aerogel blankets he could use to make some small metal castings.

Continue reading “A Small, 1000W Induction Heater”

A DIY Mobile Soldering Iron

Cordless soldering irons are, as a rule, terrible. A few months ago, you could pick up a cordless soldering iron from Radio Shack that was powered by AAA batteries. You can guess how well those worked. There are butane-fueled soldering irons out there that will heat up, but then you’re left without the requisite degree of temperature control.

[Xavier] didn’t want to compromise on a mobile soldering iron, so he made a desktop version portable. His mobile temperature controlled soldering iron uses the same electronics that are found in inexpensive Hakko clones, and is powered by a LiPo battery.

The soldering station controller comes directly from eBay, and a DC/DC boost converter accepts just about any DC power supply – including an XT60 connector for LiPo cells. A standard Hakko 907 iron plugs into the front, and a laser cut MDF enclosure makes everything look great. There were a few modifications to the soldering station controller that involved moving the buttons and temperature display, but this build really is as simple as wiring a few modules together.

With an off-the-shelf LiPo battery, the iron heats up fast, and it doesn’t have a long extension cord to trip over. With the right adapter, [Xavier] can use this soldering station directly from a car’s cigarette power port, a great feature that will be welcomed by anyone who has ever worked on the wiring in a car.

Continue reading “A DIY Mobile Soldering Iron”