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Sunday, 9 February 2025

My 3.5X MHz Voltage Tuned VFO -- Have I gone crazy?

 

 
My Voltage Tuned VFO - Have I gone crazy?

I built a 3.5X MHz scratch voltage controlled VFO for home brew radios. No PLL circuit -- a free running variable frequency oscillator. Have I gone mad?  Perhaps. Complete design + analysis, plus a short assessment of frequency stability due to temperature changes at 2 frequency bands.

* RESOURCES *

Brad's VFO Story  How to make a temperature stable VFO
https://youtu.be/kcc8V5IMmlw

SolderSmoke Daily News -- Ham Radio Blog
https://soldersmoke.blogspot.com/ 

Iulian, YO3DAC - VA3IUL Website
https://www.qsl.net/va3iul/



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5 comments:

  1. Anonymous9 February 2025 at 12:29

    really good

    ReplyDelete
  2. Anonymous19 February 2025 at 12:58

    Did you play these riffs yourself...?

    ReplyDelete
  3. Vasily Ivanenko21 February 2025 at 14:06

    Yes. All guitar or piano is me. All guitar is from amps I designed and built. Thank you.

    ReplyDelete
    Replies
    1. Anonymous24 February 2025 at 11:36

      It's sounding great. I used to play electric guitar as a hobby, hence my question. And no, you've not gone crazy, building a free running oscillator can be very satisfying. I melted tons of solder in the past trying out all sorts of topologies. "The joy of oscillation!" Very inspiring blog you have, keep up the good work!
      73,
      Wout
      PE1GXH

      Delete
    2. Vasily Ivanenko25 February 2025 at 10:10

      Thank you Wout. Best to you!

      Delete