A PS/2 data tap over audio line in.
I thought it would be a fun thing to do.
PS/2 keyboards transmit data at between 11 and 16 kHz, which is easily within range of every modern sound card. This board and software allow a user to tap a PS/2 line and read the transmitted keyboard data via the line in socket on the host.
The data could also be transmitted over a radio link, although loss in quality would hamper decoding of the data.
- 2x PS/2 connectors (mini-din 6): On Shore Technology Inc, MD-6006 connectors - http://www.digikey.com/product-search/en/connectors-interconnects/circular-connectors/1443097?k=md%206006
- 2x 3.5mm Jack: Switchcraft Inc, 35RASMT2BHNTRX - http://www.digikey.com/product-detail/en/35RASMT2BHNTRX/SC1489-1-ND/2754494
- 2x 2k2 resistor: -
- 2x 1k resistor: -