PSK31 Adapter
The ATmega8 microcontroller-based PSK31 Adapter is an innovative sound card interface. An electronically programmable and adjustable potentiometer automatically optimizes audio levels, eliminating the need for manual adjustments.
Link: http://www.circuitcellar.com/avr2004/DA3145.html
The ATmega8 microcontroller-based PSK31 Adapter is an innovative sound card interface. An electronically programmable and adjustable potentiometer automatically optimizes audio levels, eliminating the need for manual adjustments.
Link: http://www.circuitcellar.com/avr2004/DA3145.html