[CW] Code Oscillator CPO was: Request for help

[Ken Lotts]

Wow, Nice circuit!  Love the shaping circuit.  I think I will try make
something close to this.  

 

From: cw-bounces at mailman.qth.net [mailto:cw-bounces at mailman.qth.net] On
Behalf Of D.J.J. Ring, Jr.
Sent: Monday, February 06, 2012 4:09 AM
To: CW Reflector
Subject: [CW] Code Oscillator CPO was: Request for help

 

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/> 

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