The aim of this circuit is to enable a system script to reset or power cycle an AP or router when they crash or lock, which does happen from time to time. This is very usefully where access to a site is limited.
Nevertheless the same circuit could be used for any remote control project where you need to switch on and off a device using a computer.
The following circuits are drawn out in such a way that it can be easily assembled on vero-board.
The design allows from 1 to 7 relays to be used.
The download link for two different versions are as follows:
One Relay: /files/1_channel_LPT_0.pdf
Seven Relays: /files/7_channel_LPT.pdf