This is known as a Colpitts oscillator and I soldered this up last night after dinner. To my surprise it worked on the first try! With the component values I used it oscillates between 0.7-2.8V at a frequency of 1.28 MHz.
this post was submitted on 05 Feb 2025
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Nice! I haven't played around with analog stuff as much as I would like, but I'm curious what was the impetus for building this oscillator? Are you doing electronic synth stuff?
1.28 MHz is about 100x over the limit humans are capable of hearing, so it's unlikely this is for a (musical) synth :)
I didn't study analog design too closely in school, but I understand that the superheterodyne technique for frequency mixing can be used to do some rather interesting things, such as taking the difference between two high frequency signals. Some things are easier to do at high frequency and then brought down to audible frequency, I imagine.
Alternatively, a synth for dogs haha
I'm also curious! Been thinking of making a synth myself even though I don't know the first thing about doing so haha It'll be a fun learning experience if I do!
Dude me too! If you ever do please post it here, I'd love to follow your process!