A USB-C Bench Power Supply

A bench power supply is one of those things that every hacker needs, and as the name implies, it’s intended to occupy a place of honor on your workbench. But with the addition of USB-C support to his DPH5005 bench supply, [Dennis Schneider] is ready to take his on the road should the need ever arise.

The build started with one of the common DPH5005 bench power supply kits, which [Dennis] says he was fairly happy with aside from a few issues which he details in the post on his blog. Even if you aren’t looking to modify your own kit with the latest and greatest in the world of Universal Serial Bus technology, it’s interesting to read his thoughts on the power supply kit if you’ve been considering picking one up yourself.

Under normal circumstances you are supposed to give the DPH5005 DC power via the terminals on the back panel of the supply, which in turn is regulated and adjusted via the front panel controls. To add support for USB-C, all [Dennis] had to do was install a USB-PD trigger module configured to negotiate 20 VDC in the back of the case and connect it to the DC input. To hold it in place while isolating it from the metal case, he used a piece of scrap PCB carefully cut and wrapped in Kapton tape.

This actually isn’t the first portable bench power supply we’ve seen. Last year we saw one that got its input power from Makita portable tool batteries, but we think all things considered, the USB-C option is probably a bit more convenient.

Bench Power Supply Packs A Lot Into A DIN-Rail Package

We’re not sure why we’ve got a thing for DIN-rail mounted projects, but we do. Perhaps it’s because we’ve seen so many cool industrial control cabinets, or maybe the forced neatness of DIN-mounted components resonates on some deep level. Whatever it is, if it’s DIN-rail mounted, chances are good that we’ll like it.

Take this DIN-mounted bench power supply, for instance. On the face of it, [TD-er]’s project is yet another bench supply built around those ubiquitous DPS switching power supply modules, the ones with the colorful displays. Simply throwing one of those in a DIN-mount enclosure isn’t much to write home about, but there’s more to this project than that. [TD-er] needed some fixed voltages in addition to the adjustable output, so a multi-voltage DC-DC converter board was included inside the case as well. The supply has 3.3, 5, and 12 volt fixed outputs along with the adjustable supply, and thanks to an enclosed Bluetooth module, the whole thing can be controlled from his phone. Plus it fits nicely in a compact work area, which is a nice feature.

We haven’t seen a lot of DIN-rail love around these pages — just this recent rotary phase converter with very tidy DIN-mounted controls. That’s a shame, we’d love to see more.

Give Your Bench Power Supply A Helping Hand

[Sverd Industries] have created a pretty cool bench power supply integrating soldering helping hands into the build. This helps free up some much-needed bench space along with adding that wow factor and having something that looks unique.

The build is made from a custom 3D printed enclosure (Thingiverse files here), however if you have no access to a 3D printer  you could always just re-purpose or roll your own instrument enclosure. Once the enclosure is taken care of, they go on to install the electronics. These are pretty basic, using a laptop PSU with its output attached to the input of a boost/buck module. They did have to change the potentiometers from those small PCB mounted pots to full size ones of the same value though. From there they attach 4 mm banana sockets to the output along with a cheap voltmeter/ammeter LCD module. Another buck converter is attached to the laptop PSU’s output to provide 5 V for a USB socket, along with a power switch for the whole system.

Where this project really shines is the integrated helping hands. These are made from CNC cooling tubes with alligator clips super glued to the end, then heat shrink tubing is placed over the jaws to stop any accidental short circuiting while using them.

This isn’t a life changing hack but it is quite a clever idea if space is a hot commodity where you do your tinkering, plus a DIY bench power supply is almost a rite of passage for the budding hacker.

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Repairing And Improving Cheap Bench Power Supplies

Cheap benchtop power supplies are generally regarded as pieces of junk around these parts. They can measure well enough under perfect conditions, but when you use them a little bit, they fall over. There’s proof of this in hundreds of EEVblog posts, Amazon reviews, and stories from people who have actually owned these el-cheapo power supplies.

One of the guys who has had a difficult time with these power supplies is [Richard]. He picked up a MPJA 9616PS (or Circuit Specialists CSI3003SM) for a song. It quickly broke, and that means it’s time for a repair video. [Richard] is doing this one better – he has the 3A power supply, that sells for $55. With a stupidly simple modification, he upgraded this power supply to the 5A model that usually sells for $100.

The problem with [Richard]’s broken power supply were voltage and current adjustments knobs. This cheap power supply didn’t use rotary encoders – voltage and current were controlled by a pair of 1k and 10k pots. Replacing these parts cost about $5, and [Richard]’s power supply was back up on its feet.

After poking around inside this power supply, [Richard] noticed two blue trim pots. These trim pots were cranked all the way to the left, and by cranking them all the way to the right, the power supply could output 5 Amps. Yes, the 3A version of this power supply was almost identical to the 5A version, with the only difference being the price. It’s a good repair to a somewhat crappy but serviceable supply, but a great mod that puts a beefier power supply on [Richard]’s desk.

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Looking Inside The Arksen Dual Power Supply

I recently picked up an Arksen dual power supply. You’ve seen these before, I’m sure, under a variety of names in places ranging from electronics stores to eBay. They look amazing for the price, and while I didn’t expect it to measure up to some of the pro supplies I have, I just wanted something to stick under my desk instead of having to move things to the bench or–worse–drag a heavy power supply over to my desk.

When I was putting together the sonic motion sensor, I found that the HC-SR04 module needed more current than I could draw out of an Arduino Leonardo. I figured this would be a good chance to use the new supply in anger. It seemed to work without too many problems. But there were a few things you might want to know if you have a similar supply or are thinking about getting a similar one.

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Making Your Own Laser Cut PSU

[Csaba] and his friend bought a 600W switching lab-style power supply unit off eBay a while ago, and after about a year of tangled wires and mess, finally decided to enclose it in a fancy box.

The PSU itself required some modification as it was just a controller and a power board — so they added a dedicated mains transformer, and a buffer capacitor. The housing is made out of 3mm plywood which they designed and laser cut specifically for the PSU — and it looks fantastic.

It includes a cooling fan, a small digital display and a whole bunch of controls for finely tuning your electronics power requirement — take a look at the demonstration video after the break.

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