[CW] Code Oscillator CPO was: Request for help

[D.J.J. Ring, Jr.]

AA7JC has wonderfully started a project and is going to buiild one up for
me.

It's isn't the interesting circuit from the Phillipine ham but another one
which seems to be good.

If anyone is also curious about the Phillipine hams's circuit and is going
to build one and wouldn't mind making another, I'd be very interested in
that particularly because my old Morse ears prefer 500 Hz now a days.

Old ears loose the high frequencies but also the brain/ear does better with
mental selectivity at lower frequencies.

Thanks everyone for their interest and support and generosity.

If you just joined the group and want the links I have them below my
signature.

73

DR

David J. Ring, Jr., N1EA <http://www.qsl.net/n1ea/>



On Mon, Feb 6, 2012 at 6:08 AM, D.J.J. Ring, Jr. <n1ea at arrl.net> wrote:

> Hello everyone,
>
> I found one that looks absolutely wonderful.  It's a bit more complicated
> than many but I'm sure you get what you pay for.  I've found the 555 timer
> chips to be repulsive sounding - the pizeo electric sounders even more
> irritating.
>
> http://english.cxem.net/rf/rf27.php
>
> As the author states:  One may think that this is a lot of circuitry just
> to make simple beep tones, but the real value of the circuit is that it
> sounds very smooth when compared to a clicky and harsh-toned square wave
> code oscillator. This circuit won't hurt your ears, even with extended use.
>
> I believe him.  I even like the frequeny of the oscillator: 500 Hz.
>
> I have another one someplace - it was by a fellow from Russian satelite
> country moved to Canada.  He had two one was nice.
>
> DU1ANV looks like he perfected this one:
> http://www.para.org.ph/membersarticles/DU1ANV/CPO.htm
> I think this is probably the best circuit - but the top one (complicated)
> has me curious.
>
> Also Jackson Harbor Press used to sell this one:
> Schematic and manual:  http://wb9kzy.com/cpo2sch.pdf
>
> Morse Express has one http://www.morsex.com/misc/ttone.htm
>
> Greg's electronics another one:
> http://www.gregsbasicelectronics.com/circuits/audio_oscillator.htm
>
> Arthur Harrison has one;
> http://www.theremin.us/Circuit_Library/twin_t_oscillator.html
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.qth.net/pipermail/cw/attachments/20120208/217c6430/attachment.html