LEK Dev

Random geek stuff. Electronics, PCBAs, wiring, printing.

[LEK Dev @lek_dev]

EMC emission and immunity testing is fun. And anxious watching live results during testing. Will it pass or fail?
Make sure long cables are adequately shielded.
Cables running near metal frames can turn them into antennas.

[LEK Dev @lek_dev]

Neopixels too small and dim?
Neopanels are big and bright!

24 LEDs controlled by single WS2811. Logically appears like a single Neopixel.

https://t.co/FlkFaeWTmV

[LEK Dev @lek_dev]

Can never have too many LEDs! WS2811 panel = ultra-bright Neopixel. Pro tip: filter your power rails, or you’ll hear the PWM buzz.

[LEK Dev @lek_dev]

DMX lighting is actually pretty easy.
Quick python script and FT232 USB-RS485 adapter is all it took.
Longest part was finding the channel definitions of a light that had no documentation.

[LEK Dev @lek_dev]

Still don't trust "good quality" capacitors, but can't decide between Nichicon or Rubycon?
Maybe "niubycon" is the brand for you.

[LEK Dev @lek_dev]

Not sure about capacitor reliability? Don't worry, these are "good quality".

I'll be sure to use these in my next circuit design.

[LEK Dev @lek_dev]

There is this in Barcelona

[LEK Dev @lek_dev]

Haven't found the electronics shopping area in Barcelona yet, but did stumble across this.

[LEK Dev @lek_dev]

Speed your projects along with the LIS2DH12 Accelerometer Board!
This ultra-low-power, high-performance 3-axis sensor is ideal for motion detection, gaming, and wearables.

https://t.co/wp3AiW55uJ

#IoT #Sensors #Accelerometer #Makers #Tindie

[LEK Dev @lek_dev]

Just released: ICM42670 Motion Tracker IMU board - a compact, high-performance 6-axis sensor for motion tracking, gaming, wearables, and more.

Get yours here: https://t.co/8eG68FnSRt

#IMU #ICM42670P #Electronics #Maker #Tindie

[LEK Dev @lek_dev]

0.5mm LGA package. Microscope, tin the board pads, tin the IC pads, good dose of flux, hot plate. Done.

[LEK Dev @lek_dev]

@gojimmypi haha yeah, but writing "lightning proof" sure is easier than something like "protected against indirect lightning effects"

[LEK Dev @lek_dev]

If you ever need RS232 on a system but only have CAN, the Waveshare CAN-RS232 converter worked great for me.
Plugged it in, configured it, up in ~5 min, no fuss.

https://t.co/paejK3zVHU

[LEK Dev @lek_dev]

OMG what a blast from the past.
Haven't needed to touch RS232 signals like this for 15yrs++.
TX -> RX and RX -> TX, get it right!

[LEK Dev @lek_dev]

https://t.co/1ZwG7rCpCC

[LEK Dev @lek_dev]

Stackable 3D printed targets for kids Nerf guns. 20 mins in Fusion 360, 3 hours print time.

[LEK Dev @lek_dev]

3D printed holder for makeup items like packets of fingernails and eyelash extensions.
https://t.co/qJJ1fhWzK7

[LEK Dev @lek_dev]

And using OctoLapse to create timelapse of it printing.

[LEK Dev @lek_dev]

Home repair weekend. Kenwood receiver not powering on. Standby voltage should be around 16V no load, but drops to 3.2 when connected to processor board. Injecting external 12VDC can bring it back to life. Is the standby trafo really that burnt?

[LEK Dev @lek_dev]

Capacitive dropper power supply.
Faulty 1uF cap that degraded to read a value of 0.1uF will cause increased reactance, Xc=1/(2*pi*f*C). This in turn will cause more voltage drop across it which lowers the supply voltage available to the controller IC.
Nice $0.78 fix.