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Bargain Bin USB-ODB Interface

ODB Adaptor
ODB Adaptor

This is a little bit of kit I got to talk to the Webasto TT-V I salvaged from a scrap Jaguar S-Type, and converts USB-RS232 to the standard car diagnostic ODB connector. (These are a much cheaper option at £4 than the official Webasto diagnostic adaptor & loom which is over £90.

PCB Top
PCB Top

There’s really not much to this adaptor, the only signals that are routed to the ODB connector seem to be the +12v on pin 16, K-Line on Pin 7 & L-Line on pin 15. The main IC here is a CH340 USB-Serial interface, with some glue logic in the form of an LM339 quad comparator.

PCB Reverse
PCB Reverse

The reverse side of the PCB only has the power indicator LED.

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MingHe D3806 Buck-Boost DC-DC Converter

DC-DC Converter
DC-DC Converter

Here’s a useful buck-boost DC-DC converter from eBay, this one will do 36v DC at 6A maximum output current. Voltage & current are selected on the push buttons, when the output is enabled either the output voltage or the output current can be displayed in real time.

Display PCB
Display PCB

Here’s the display PCB, which also has the STM32 microcontroller that does all the magic. There appears to be a serial link on the left side, I’ve not yet managed to get round to hooking it into a serial adaptor to see if there’s anything useful on it.

Display Drive & Microcontroller
Display Drive & Microcontroller

The bottom of the board holds the micro & the display multiplexing glue logic.

Main PCB
Main PCB

Not much on the mainboard apart from the large switching inductors & power devices. There’s also a SMPS PWM controller, probably being controlled from the micro.

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LB-Link USB Wireless-N Adaptor Teardown

I needed a decent WiFi adaptor for my latest Pi LCD project, so after trawling eBay for cheapy USB adaptors, I found this one.

USB WiFi Dongle
USB WiFi Dongle

Unlike most USB WiFi radios these days, it actually has a proper RP-SMA antenna connector, not the low-gain built in jobbies that never seem to work too well.
There are a few versions of this adaptor, all of which seem to use the same casing, there’s a button push cut into the plastic for a WPS button that doesn’t exist on this model. This is fine, as I don’t enable WPS on any of my network equipment anyway. (It’s insecure, and can be cracked in minutes).

MAC Address
MAC Address

Here’s the rest of the essential details, the model is BL-LW08-AR, rated at 300Mbit/s.

PCB Reverse
PCB Reverse

Here’s the PCB removed from the casing, there are a pair of PCB antennas on here, but they’re not connected to the RF circuitry in this model, the links are missing.

Chipset
Chipset

The chipset used is a Realtek RTL8191SU, there isn’t much more in this device, as it’s all built into the silicon.