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(tr)uSDX Audio Adapter

author: K6ARK
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2 layer board of 0.82 x 0.73 inches (20.8 x 18.6 mm)
Uploaded: June 20, 2022
Shared: June 28, 2022
Total Price: $2.95

Provides 20 dB of attentuation to condition line level audio to and from the (tr)uSDX to prevent overload and distortion of signal in digital mode operation.

Assemble the adapter, and plug into (tr)uSDX with resistors facing down. Note board labels for each plug. Insert a TRRS cable into the adapter. Connect audio cable to computer or phone TRRS combo jack, or to headphone and mic jack using a splitter. Set (tr)uSDX volume to 10. Set computer/phone audio volume level to 100%. To trigger PTT on transmit, either set up CAT control or use VOX mode.

ASSEMBLY:

  • Solder resistors in labeled positions on board and trim leads.

  • Solder TRRS 4 pin jack onto board.

  • Install TRS plugs into radio sockets with solder pins pointing up.

  • Place board onto TRS plug solder pins with resistors facing down. Solder into place.

PARTS LIST:

2ea. TRS Pins Plugs: https://www.digikey.com/en/products/detail/tensility-international-corp/54-00036/5609421

2 ea. 10k ohm 1/8w resistors: https://www.digikey.com/en/products/detail/stackpole-electronics-inc/CF18JT10K0/1741566

2 ea. 1k ohm 1/8w resistors: https://www.digikey.com/en/products/detail/stackpole-electronics-inc/CF18JT1K00/1741612 (Or equivalent through hole resistors)

1 ea. 3.5mm 4 pin jack: https://amzn.to/3NtxQJv (Amazon affiliate link)

1 ea. TRRS cable: https://amzn.to/3NpYUt5 (Amazon affiliate link)

Optional: 1 ea. TRRS to dual TRS splitter: https://amzn.to/3xZaCFw (Amazon affiliate link)

Provides 20 dB of attentuation to condition line level audio to and from the (tr)uSDX to prevent overload and distortion of signal in digital mode operation.

Assemble the adapter, and plug into (tr)uSDX with resistors facing down. Note board labels for each plug. Insert a TRRS cable into the adapter. Connect audio cable to computer or phone TRRS combo jack, or to headphone and mic jack using a splitter. Set (tr)uSDX volume to 10. Set computer/phone audio volume level to 100%. To trigger PTT on transmit, either set up CAT control or use VOX mode.

ASSEMBLY:

  • Solder resistors in labeled positions on board and trim leads.

  • Solder TRRS 4 pin jack onto board.

  • Install TRS plugs into radio sockets with solder pins pointing up.

  • Place board onto TRS plug solder pins with resistors facing down. Solder into place.

PARTS LIST:

2ea. TRS Pins Plugs: https://www.digikey.com/en/products/detail/tensility-international-corp/54-00036/5609421

2 ea. 10k ohm 1/8w resistors: https://www.digikey.com/en/products/detail/stackpole-electronics-inc/CF18JT10K0/1741566

2 ea. 1k ohm 1/8w resistors: https://www.digikey.com/en/products/detail/stackpole-electronics-inc/CF18JT1K00/1741612 (Or equivalent through hole resistors)

1 ea. 3.5mm 4 pin jack: https://amzn.to/3NtxQJv (Amazon affiliate link)

1 ea. TRRS cable: https://amzn.to/3NpYUt5 (Amazon affiliate link)

Optional: 1 ea. TRRS to dual TRS splitter: https://amzn.to/3xZaCFw (Amazon affiliate link)

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      Hey there! Before ordering, make sure you have all the info you need to complete and use this design. This usually means a component list, and sometimes additional information such as assembly notes, source code, or usage guides.
      Since this is a project designed by a community member, it may contain design errors that prevent it from working as intended. OSH Park cannot place any guarantees about the functionality or correctness of the design.
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