Quoi de neuf 2021

From Eric

Experiments carried out in the past (from 2011) are described hereafter: 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011

February 2021

January 2021

• I have moved my lab to a new, large, room:
  

  
• Waiting for the transformer to drive an CRT (see Quoi de neuf 2020, december).
• I have created a LED "spectrum analyzer" using an electret microphone, a 5532 op amp (see here), a BA3830S spec. anal., and a LM3914 LED display driver. Nothing very complicated, but just a way to occupy time. Here is a picture of the breadboard setup:
  File:Spectrum analyzer led bb.jpg

  400px
  , the scheme
  

  
  and the PCBs
  

  
  

  
  .
• I am also playng with my cubecell. I have attached a solar panel, a battery, and a CJMCU-8128 set of sensors. The guy transmits it data via LORA to a ESP32 which ralays them to a MQTT Mosquitto server running on an Rasp PI.