[Coco] Source for CoCo cassette cable, or components to build one?

[Christopher Barnett Fox]

I have a CoCo cassette cable I purchased off eBay for the purposes of
loading HDB-DOS by "cassette" for DriveWire, but it's unidirectional. I
can load audio files from a connected source, but can't save.

Is there a source for the full cable, with in/out/remote, or a good list
of required components and source to build one?

Just trying to maintain as much flexibility as possible dealing with files
for my growing collection of CoCos.

Thanks!

Christopher