←back to thread

It's hard to build an oscillator

(lcamtuf.substack.com)
219 points chmaynard | 1 comments | 21 Nov 25 07:45 UTC | HN request time: 0.199s | source
Show context
Mizza ◴[21 Nov 25 09:31 UTC] No.46002839[source]▶
Never found it hard to build an oscillator, the hard part is musical voltage per octave. 3340 repro chips are the way to go, the best non-3340 circuit I've seen is this one and it's still temperature-sensitive: https://www.youtube.com/watch?v=FiCMjt0mqvI
replies(2): >>46003023 #>>46008223 #
ofalkaed ◴[21 Nov 25 10:07 UTC] No.46003023[source]▶
Temperature sensitivity only matters in polysynths where you don't have easy access to per-oscillator tuning. It is not difficult to build an oscillator with better pitch stability than a guitar, even my VCOs with no temperature compensation require less tuning than any guitar I have owned.
replies(1): >>46003086 #
Mizza ◴[21 Nov 25 10:19 UTC] No.46003086[source]▶
But that's for synths where the oscillators are ICs. I'm talking about simple oscillators from basic components
replies(1): >>46003172 #
1. ofalkaed ◴[21 Nov 25 10:34 UTC] No.46003172[source]▶
My VCOs which lack temperature compensation are oscillators built from basic components. The closest I have to oscillator on an IC these days, are the VCOs in my Moog Prodigy which use a quad OPAmp and a 3086 transistor array, it is far more stable than any guitar string.