Tag: power conversion

Tecknet TK-WD004 doorbell 230V AC to USB conversion (WHL #98)

A while back, the landlords decided to toss the old doorbell system. It was fine for ringing, but the audio part was troublesome (50Hz hum of some transformer supply), plus the physical call buttons were mashed multiple times by some brutes and beyond repair. I never used the phone system, it’s just two meters away from the actual front door. The landlords also didn’t bother, because opening the actual door (plus their apartment door) can’t be done electrically, so someone still needs to dash down. It’s a bit of a granny flat situation, so live on ground level and they take up the rest of the building. […]

28th April 2024 29th April 2024 By Bzzz In 1 Comment

Bosch Professional GAA 18V-24 USB charging adapter 1600A00J61 1600A00J5W (WHL #49)

Something out of the ordinary for today, a brand new item, bought for disassembly and kind-of off-label use. A Bosch Professional USB charger which happens to have a 12V port also…

Contrary to my very first thought when I found this charger, it does NOT allow 18V batteries to be charged from USB or a 12V source. Maybe I should test that, but I doubt it. However, it does convert the other way – stick in a 18V power tool battery (ranging from 1.5Ah to 12Ah as of today) and get a USB charger with a lot of oomph, or a “heated jacked” power source with a lot of potential for baggy pockets. […]

12th May 2019 12th May 2019 By Bzzz In No Comment

24V to 5V 10A 50W DC DC Converter Regulator Car Step Down Reducer 24V to 5V 10AMP Daygreen CE Certificated (WHL #46)

Alright, part two of the DC-DC converter tests that’ll lead to a small project. This time we got a 5V/10A converter from Daygreen, model number B10-1224-05, shipped together with the 12V/10A unit from WHL #44. This item was 2.41€ excluding shipping, as described in that blog post.

It’s a brick style unit as well, a tad smaller, but also has two mounting holes left and right which are flush with the case. Contrary to the more powerful 12V one, this is only a plastic case that was potted, but it has four screw terminals and therefore offers more flexibility when it comes to attaching your own wiring. […]

22nd January 2019 22nd January 2019 By Bzzz In No Comment

24V to 12V 5A 10A 120W DC DC Converter Step Down Daygreen 1A 2A 3A 6A 8A Voltage Regulator Newest Type CE, 10,000pcs in Stock (WHL #44)

[Just updated to WordPress 5.0 – slight errors in the Matrix might occur]

Overengineered parts from China aren’t really my cup of tea, but this is for an upcoming project with power-hungry, rotating AND rusty plates, so I figured I would use something up for the task…

…and I don’t think I paid that much of a premium for it. So today’s item is a step-down converter model “D121” rated 10 amps at 12V, with 15-32V input voltage. Price was 2.86€ at the time; contrary to the usual item on this site, this was without shipping cost. […]

9th December 2018 9th December 2018 By Bzzz In 1 Comment

250W DC-DC Boost Converter Adjustable 10A Step Up Constant Current Power Supply Module Led Driver For Arduino (WHL #21)

What do you do when none of your existing power supplies can provide enough power for some decent LED module? Yeah, right, you buy a bigger one!

So I did. I had some 100W/150W DC-DC converters laying around, but most of them cap at around 36V. And with the very nice Toshiba E-Core 92W LED module that wants 40V or more, that’s just not good enough (same goes for the popular 25W/50W/100W LED modules!). So the new one in my collection is this:

Some more shots:

I bought it on AliExpress back in mid-January for 4.31€ including shipping.

Tech specs are, according to the seller: 250W total output power (boost = step-up only), non-isolated output, input current 8A or 10A with additional heat sinking. […]

1st April 2017 1st April 2017 By Bzzz In 4 Comments