Interesting. Thank you. As drawin, simulation shows ~844Hz. witch is close to the built circuits. This is in several test boxes I'm working on and I decided to change out for an LTC6902 square wave IC with a level shifting amp. for my application, the square wave or a LPF'd square don't work as well as this circuit, possibly due to harmonic content. FFT shows fairly linear drop-off compared to the harmonics of the square or LPF.
[image: Inline image 1] On Wed, Aug 30, 2017 at 9:58 AM, Nick Sargeant <[email protected]> wrote: > It's a phase shift oscillator. It generates a sine wave at a frequency > which gives a 180 degree phase shift output to input. With only two stages, > it won't be very stable. I found a formula that says F= > 1/(2*Pi*R*C*sqrt(2*number of stages)) .. where R is the value of the > resistor between caps to ground, and C is the value of each capacitor - > which ends up at about 160Hz with 0.01uF and 5K. > > > On Wednesday, 30 August 2017 14:18:10 UTC+1, MrStevenUND wrote: >> >> I have an oscillation circuit that I would like to know the name of. I'm >> told this is a "classic" op amp design but I can't find it in the Forest >> Mims books or anywhere I've looked online. Can anyone identify it? >> >> Thanks, >> Steve >> >> [image: Inline image 1] >> > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web, visit https://groups.google.com/d/ > msgid/neonixie-l/985f1a21-6688-4e8f-9826-6918320784b7%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/985f1a21-6688-4e8f-9826-6918320784b7%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CAOXC3DEvQoD_J1e-J0oUHQSH0sFbXmL3iVBFhB6dFr7yJ9u4Pw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
