[CW] Code Oscillator CPO was: Request for help

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

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
 David J. Ring, Jr., N1EA <http://www.qsl.net/n1ea/>
SOWP <http://www.sowp.org/>, VWOA <http://www.vwoa.org/>,
OOTC<http://www.ootc.us/>,
FISTS <http://www.fists.co.uk/>, CW-Ops <http://www.cwops.org/>,
CFO<http://groups.google.com/group/Chicken-Fat-Operators-Club?hl=en>,
A1-OP <http://www.arrl.org/a-1-op>, ex-FOC 1271 ARRL-LM<http://www.arrl.org/>
 Chat Skype: djringjr MSN: djringjr at msn.com AIM: N1EA icq: 27380609
 Radio-Officers Google
Group<http://groups.google.com/group/radio-officers?hl=en>-- Marine
Morse Historic Recordings Page <http://www.qsl.net/n1ea/>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.qth.net/pipermail/cw/attachments/20120206/dd9471dc/attachment.html