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20190202 - Optically Isolated Digital Audio Interface

posted Feb 1, 2019, 8:08 PM by Onno Benschop   [ updated Feb 1, 2019, 8:14 PM ]
Charles NK8O shares with us a kit that is available via eBay:
Nothing new about this technology, it consists of two 600 ohm line transformers for audio input and output from your pc to your transceiver, and an opto-coupled push to talk circuit that works off of an RS-232 port on your computer.
  • Transformer coupled audio eliminates ground loops and AC hum on your signal
  • Opto Coupled push to talk circuit also eliminates ground loops and false triggering of your PTT lines.
  • Very small size, only 2 1/16” x 1 3/8” x .625” high, can be incorporated inside of many radios, with only your RS-232 cable coming outside of the radio.
  • Weighs less than 3 ounces
  • High quality FR-4, solder masked, silk screened Printed Circuit Board
  • Compatible with most modern ham radio transceivers.
Shipping is a tad expensive to Australia, $35.05

Same board with some more detail is here:

#audio #interface #digital #isolation #opto #nk8o #ebay