The JC-1 came in two versions, the -DC, battery powered and the -AC version, with an external power supply.
It seems that some models use modules (eg. black boxes) some don't.
It was (of course) was designed by John Curl.
This page is for the JC1, you can also have alook at the following pages:
- the JC1-DC
- and the JC1-AC