MicroCrystal RV-8803 – A Really Accurate RTC June 17, 2019- RTC chips traditionally were the domain of Maxim and NXP. Switzerland-based MicroCrystal recently made quite a buzz with its RV-8803, which offers simple integration, an I2C interface and extreme accuracy. Let us start out by looking at a system overview. Figure one shows how this I2C RTC is made up internally – interested observers note […] Analog Devices’ LTM2887 – If a Digital Bus Needs Galvanic Isolation June 15, 2019- In theory, digital buses are intended to connect things to one another. Sadly, one sometimes wants but a logical connection – in many cases, galvanic isolation helps out. Should you ever feel like isolating very fast buses, definitely give the LTM2887 a chance. From a technical point of view, Linear Technologies attempt at entering the […] AVAGO APDS-9008 or APDS-9005-020 – Keeping an Eye on Ambient Light June 14, 2019- Recent times saw quite a bit of interest for part numbers such as the APDS-9008 or APDS-9005-020 – they are a very interesting type of ambient light sensor. One of the oldest questions in regards to light sensors involves their spectral sensitivity. If a part is to output but one voltage level, the conversion between […] STMicroelectronics’ LIS2DH12 – Low Power Motion Sensing June 12, 2019- Apple’s iPhone introduced gyroscopic sensors to a wider range – before that, accelerometers were not commonly found in consumer hardware. STM sells excellent parts which, however, get little media attention – time to take a look at the LIS2DH12. Integrating the part into your circuit as an MPU6500 alternative or MPU9500 alternative is not difficult. […] Panasonic AMG8833 – FLIR for cheap June 7, 2019- FLIR made infrared thermal sensors cool – sadly, their parts are all but cheap (and suffer from export control problems). Panasonic’s Grid-EYE family is a low-resolution alternative which comes at significantly lower cost. From a technical point of view, Panasonic’s image sensor could not be simpler. We are looking at an 8×8 sensor with an […] DipTronics DTS-62R-V – Small Switch, Very Big (and Very Cheap) June 5, 2019- When yours truly was but a lowly cadet, various US manufacturers produced (pricey but quite reliable) switches. Chinese vendors recently started to catch up – seeing the DTS-62R-V top our customer interest list shows that the run stage of the crawl-walk-run cycle is reached. DipTronics has been around the Asian switch market for ages, exhibiting […]
Even though recent failures of vintage HP test equipment have Joe Boeschert a bad name, history has all but vindicated his decision to become a pioneer of switching regulators. Their success has pushed classic transformers into the background – a significant mistake.
In many cases, transformer-based supplies can be more efficient. This is caused by multiple factors: in addition to less EMI issues, a dedicated transformer sometimes is cheaper than the various parts needed to protect the switcher.
One interesting candidate comes from Myrra…
One interesting candidate comes from Myrra – based in France and Poland, the company has a long history of building transformers. One particularly interesting part is the Myrra 44266, and is a member of their family of PCB-mountable transformers.
This is not a hallucination: the transformer comes with hold pins which allow the part to be soldered onto your PCB like any other large inductor. Due to the relatively high weight (which the manufacturer does not specify), using a cable tie or a bit of glue to securely fix the part is recommended.
When installed, the 44266 behaves just like any other transformer – it wants an input voltage of 230 volts AC, and breaks it down to a nominal voltage of 9V. The power rating of 10VA, then, allows us to deduce the maximum current handled by the transformer to be 1.111A.
…the part is certified according to UL 5085, VDE, EN 61558-2-6 and EN 60950
This part differs from its competitors by the wide amount of certifications – the part is certified according to UL 5085, VDE, EN 61558-2-6 and EN 60950. The transformer provides an insulation voltage of up to 4 kV, and promises that the secondary coil is short-circuit proof by design (an interesting document on that is found by Clicking Here. Should disaster ever since your application, the plastic case is self extinguishing according to the UL94-V0 standard.