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N4LCV
08-14-2010, 08:08 PM
Some years ago, I built a CW Keyer based on the Curtis 8044 chip. I must have used the 8044 BM because the keyer I built had a speed meter which was a nice thing to have. I don't believe that chip is available any longer. The circuit board was for an 18 pin chip, and I believe that all that is made now is a 20 pin version. I have a new circuit board for the 8044 keyer, but no chip.

So, unless someone has an 8044 chip they want to sell, I would like to build another keyer, and would like some recommendations. Two important considerations would be (1) availability of parts, and (2) a printed circuit board.

Thanks

N4LCV

WA7PRC
08-14-2010, 08:42 PM
I've built a couple of keyers but none using a single IC... the WB4VVF Accu-Keyer and the "Simple CMOS Keyer" from the Handbook. I added a sinewave oscillator + amplifier to the Accu-Keyer (I detest squarewave sidetone oscillators). I use the Accu-Keyer at home and the other keyer while mobile.

Those were built many moons ago. Today, you might try FAR Circuits (http://www.farcircuits.net/keyers1.htm) for a PCB and/or parts. They have several to offer. AC6V lists many kit & PCB suppliers: http://www.ac6v.com/kits.htm

KI6J
08-15-2010, 05:26 AM
The K12 kit from K1EL is a nice kit and reasonably priced.
http://k1el.tripod.com/K12.html
If you are willing to go boardless the SKC "kit" from KD1JV is unbeatable.
http://kd1jv.qrpradio.com/skc/SKC.HTM

KD7MSC
08-15-2010, 06:10 AM
Anything from K1el is great!

Also N0XAS has some great kits too. http://www.hamgadgets.com/

WA7PRC
08-15-2010, 06:55 AM
Morse Express (http://www.mtechnologies.com/) has (of course) a few kits.

W9GB
08-15-2010, 02:07 PM
Earlier QRZ question about CW keyers, Curtis 8044 chip set, etc.
http://forums.qrz.com/showthread.php?t=203564

For NEW designs, you can use the MFJ CK-8045ABM Curtis Keyer Chip.
MFJ purchased the Curtis design, made some updates/changes and
still sells this Curtis keyer chip for about $30.

This new MFJ 8045 series IC design is NOT plug-n-play compatible -- with earlier chip designs!!

===
Micro-TO Keyer (Classic August 1967 QST magazine by K3CUW) - DIY design and keyer build.
A solid-state version of the classic W9TO keyer design !

K8CU built one for the 40th anniversary of the QST article
The parts are available from the transistor museum !
Uses Fairchild uL923 JK flip-flops and a uL914 logic gate (obsolete RTL logic family) produced in 1960s
http://www.realhamradio.com/micro-TO-keyer.htm

w9gb

G4LNA
08-15-2010, 06:06 PM
If you are feeling adventurous then how about this one. I built this one back in 1982 and I'm still using it. It's a plain simple keyer, no memories, but I'm not worried about that as the radio has memories, so I use them instead.

The is no PCB but there is the pattern for one, but it can be built on strip board quite easy. The only modification I found I had to do was to place a 1000pf capacitor across IC8b pin 11 to ground to stop spurious spikes from the clock giving false triggering.

I can still get all the parts here in the UK, so I'm sure you'll be able to get them in the US no problem at all.

Happy building ;)

Oh well, it won't let me upload the PDF file, it's well under the file size, so it's tough luck, sorry. Blame the Zed not me.

W5SMD
08-16-2010, 05:17 PM
I am probably going to get the model p4 from www.cwtouchkeyer.com. It looks like a pretty good little kit. Now, if I could just get my wife to agree with me...:D

AB9LZ
08-16-2010, 11:11 PM
You could go in the in the other direction and buy a Pickit and teach yourself how to program your own keyer (it really isn't that hard), Next thing you know, you'll be using the little PICs *everywhere* :)

73 m/4

DL7GEM
08-20-2010, 06:51 PM
You could go in the in the other direction and buy a Pickit and teach yourself how to program your own keyer (it really isn't that hard), Next thing you know, you'll be using the little PICs *everywhere* :)

73 m/4

That is more or less what I did, although with an Atmel microcontroller (ATtiny84). Try it -- it's fun!

73 de Marcus/DL7GEM