Photo of the display of a Hama PDF20 DAB+/FM receiver

Denoising the Hama PDR20 DAB+/FM receiver

Here's another episode of my quest for a decent DAB+ receiver, this time checking out a Hama PDR20. I was (and still am) quite impressed by the fact that it comes with a single piece of wire attached to a female SMB connector as its antenna, and still yields a fairly good signal strength. So what's the problem? Well the device features two 3.5mm output connectors, both of which are outputting a nasty noise signal. Here's how to tame the beast...


Stock photo of a motherboard, from

Sniffing the SMBus

There's plenty of ways to add a temperature display to a desktop computer. But capturing temperature readings from the system management bus (SMBus) isn't among the widely used techniques. As the SMBus is very similar to I2C in its nature, technically it shouldn't be too complicated to monitor (and decode) the data exchange on the board. Unfortunately, there's a bunch of challenges included here, as the hardware I2C on many microcontroller boards will only capture traffic directed to a single slave address. Here's my workaround, showing how to use a Teensy 2.0 to capture the data.

#Hardware #Software

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Peeking inside a cheap Lightning adapter

What to expect when you receive an adapter that breaks out Apple's Lightning plug into a replicated charging port and a 3.5mm audio output? The answer is: Not much audio-wise. Here's a glimpse to the inside of this thing (spoiler alert: there's not much to see).


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The SMD Challenge

A good while ago I stumbled across the 'SMD challenge': A PCB kit to test your SMD soldering skills all the way down from 1206 to 0201 parts. It took me a good while to source the parts (why does barely anyone stock LEDs in SMD 0201 form factor?), but now the time had finally come to assemble it.


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Characterizing the SMD diode marked B88

A good while ago I had ordered a bunch of PMEG3050EP SMD Schottky diodes. When the parts eventually arrived from China, however, they weren't marked 'A7' on the case but 'B88'. The part still looked like a diode, but I couldn't find any data sheet or specs. So I decided to run a few measurements.