Parts were used from this old ISA sound card which were popular in IBM computers back in the 90's. The experimental H11AA1 Optocoupler was also pulled from this board for the PTT circuit.
PSK31 Project |
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Parts were used from this old ISA sound card which were popular in IBM computers back in the 90's. The experimental H11AA1 Optocoupler was also pulled from this board for the PTT circuit.