2 ms·

I came across this while looking at all kinds of clocks and the origins of operational amplifiers. I've used these but never realized that you could use the hys

I came across this while looking at all kinds of clocks and the origins of operational amplifiers. I've used these but never realized that you could use the hysteresis to make counters. I originally found this link: https://www.pa3fwm.nl/projects/sdr/ https://www.pa3fwm.nl/projects/sdr/ About a completely home-grown software defined radio that is on the web as well at http://websdr.ewi.utwente.nl:8901/ http://websdr.ewi.utwente.nl:8901/ , you can use it to listen to all kinds of interesting signals, for instance an atomic clock, DCF77 at 77.5 KHz CW. That project is absolutely mind-blowingly complex and the fact that it works at all has me amazed.

bb88 9mo ago
These days I really like the kiwiSDR. http://kiwisdr.com/.public/ http://kiwisdr.com/.public/ The WEB SDR interface has grown up quite a bit in the past 15 years.
- jacquesm 9mo ago
  Great stuff!
Levitating 9mo ago
That SDRs antenna is actually visible at the top of one of our university buildings. The author, pa3fwm was my bachelor thesis supervisor.
- jacquesm 9mo ago
  Oh super cool. What's interesting is that to my eye it looks horrific at first glance but the longer you look the more you realize how advanced this whole thing is.