I need a MIDI Thru Box and what could be more obvious than to make it myself. There are many good examples on the internet and I decided on this MIDI Thru Box.
I used a simple case that I have already used for other projects and that fits well into my collection. On the front are 5 MIDI-Thru sockets and one MIDI-In socket. There is a signal indicator LED and a power switch with LED.
The back side only contains the 9V socket.