[nrv-hams] Sine Wave Morse Code Oscillator Circuit Needed

[Alvin P. Schmitt]

https://www.google.com/search?q=how+do+you+get+a+sine+wave+from+a+square+wave+circuit&sca_esv=554492d1fd62c51c&sxsrf=ADLYWIJqd2SaJGzaOZrPEQi32KDfCfsTqA%3A1720701822058&source=hp&ei=ftOPZo_FAZmu5NoPwbW6uAc&iflsig=AL9hbdgAAAAAZo_hjjYx0hYsYOqP7lCWqGu9tj_czDU0&ved=0ahUKEwiP_PbmgZ-HAxUZF1kFHcGaDncQ4dUDCBc&uact=5&oq=how+do+you+get+a+sine+wave+from+a+square+wave+circuit&gs_lp=Egdnd3Mtd2l6IjVob3cgZG8geW91IGdldCBhIHNpbmUgd2F2ZSBmcm9tIGEgc3F1YXJlIHdhdmUgY2lyY3VpdDIFECEYoAEyBRAhGKABMgUQIRigATIFECEYoAEyBRAhGKABMgUQIRirAkiSBlAAWABwAHgAkAEAmAFkoAFkqgEDMC4xuAEDyAEA-AEC-AEBmAIBoAJrmAMAkgcDMC4xoAfWCA&sclient=gws-wiz

On Thu, Jul 11, 2024 at 8:25 AM Cam Coble <cam at doubleclickdata.com> wrote:
>
> Not as easy as I thought...
>
> OK, there are *plenty* of circuits out there making use of 555 timers and
> other methods that create square waves, and I can certainly filter the
> output to make it sound a little better, but I'm reaching out to find if
> anyone has a link or schematic for a nice sine wave oscillator for CW
> practice.
>
> If there is a good kit, send that link too, but I prefer to scratch build.
> This may be something we use for a Winter Build Project if I get the time.
>
> My last attempt was using a side-tone generator from the W1FB's QRP
> Notebook (pp145 lower left circuit) along with an LC filter. I evidently
> need practice with my filters as It looks like I only got the start of the
> square wave smoothed out. This helps, but there's nothing like the sound of
> a real sine wave.
>
> Target is 700 Hz (or variable), and at least headphone output levels.
> Bonus for some debouncing for use with a Bug.
>
> Help!!!
>
> 73
> --
> Cam, W4XXV
> ______________________________________________________________
> nrv-hams mailing list
> Home: http://mailman.qth.net/mailman/listinfo/nrv-hams
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:nrv-hams at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html