This website is the continuation of my old website at www.wb5tfv.com. That site is no longer maintained but I intend to keep it active for the foreseeable future. The original version of the CPO1 Code Practice Oscillator is described there.
Here is a photo of the assembled kit in its current configuration:

Based on feedback received from the initial run of kits, there are a couple of changes to the CPO1.
- The key jack (J2) has been rewired to accept either a stereo or mono 3.5mm plug.
- C6 has changed from a 100nF capacitor to a 10uF electrolytic.
The new schematic is shown below. A PDF version can be downloaded here: CPO1 Schematic
The manual for the kit can be downloaded here:
CPO1 Assembly and Operations Manual

Hi
Are pcbs or kits still available for your CPO1 Code Practice Oscillator? If so how can I order?
Thanks
Michael
Hi Michael,
All of the kits have sold out and, at this time, I don’t plan on kitting up any more of them.
Steve
Hi, any chance you are producing and selling these awesome kits or the PCBs again?
Thanks
Hi Brian,
At this time I don’t have plans to kit any more of these.
Steve