EENT Econet interface
The EENT (“Electron EcoNet Twee”) is an Econet interface for your Acorn Electron. It was designed by Roland Leurs, a very active Acorn enthousiast in the Netherlands.
The design uses through-hole components exclusively, for ease of assembly. I spent a little over an hour putting it all together - not bad! The PCB fits in an Electron Plus 1 cartridge slot. I designed and printed a simple 3D-printed protective case for the PCB, but the socketed ICs made it too thick so it would not properly fit in the cartridge slot.
For now, I settled on one half cartridge to at least offer some protection to the EENT. In my next design iteration, I may need to leave a cutout for the socketed ADLC chip as it sits quite high on the PCB. This could easily reduce cartridge thickness by another millimeter.
Since the Acorn Electron is slower than the Acorn BBC-B, you may need to adjust your Econet clock speed for reliable operation.