2 layer board of 1.78 x 1.58 inches (45.2 x 40.1 mm)
Uploaded:
March 11, 2021
Shared:
March 11, 2021
Total Price:
$14.00
Sound card to computer interface for radios. Uses a custom VOX circuit to handle PTT. The PTT turn off speed is controlled by R4 (make R4 smaller to turn off faster). The jacks, as placed on the board, are for a laptop/smartphone TRRS connector from a computer/phone and output TRS connectors for …
Sound card to computer interface for radios. Uses a custom VOX circuit to handle PTT. The PTT turn off speed is controlled by R4 (make R4 smaller to turn off faster). The jacks, as placed on the board, are for a laptop/smartphone TRRS connector from a computer/phone and output TRS connectors for a Kenwood or Baofeng radio.
all caps are 10 uF
Resistors are all 10k (make R4 <10k if you want a faster turn-off time)
diodes are schottky diodes (whatevre you have)
transistor is any NPN (PN2222A or 2N3904 are fine) with EBT pinout
Transformers are low-power 600:600 ohm transformers (e.g., EI14 or similar such as https://www.amazon.com/10Pcs-Audio-Transformers-600-Transformer/dp/B075R2PF4R)
Jacks are optional, and are PJ-320a if you want the exact ones. But you can just hard wire them too.
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Sound card to computer interface for radios. Uses a custom VOX circuit to handle PTT. The PTT turn off speed is controlled by R4 (make R4 smaller to turn off faster). The jacks, as placed on the board, are for a laptop/smartphone TRRS connector from a computer/phone and output TRS connectors for …
Sound card to computer interface for radios. Uses a custom VOX circuit to handle PTT. The PTT turn off speed is controlled by R4 (make R4 smaller to turn off faster). The jacks, as placed on the board, are for a laptop/smartphone TRRS connector from a computer/phone and output TRS connectors for a Kenwood or Baofeng radio.
all caps are 10 uF
Resistors are all 10k (make R4 <10k if you want a faster turn-off time)
diodes are schottky diodes (whatevre you have)
transistor is any NPN (PN2222A or 2N3904 are fine) with EBT pinout
Transformers are low-power 600:600 ohm transformers (e.g., EI14 or similar such as https://www.amazon.com/10Pcs-Audio-Transformers-600-Transformer/dp/B075R2PF4R)
Jacks are optional, and are PJ-320a if you want the exact ones. But you can just hard wire them too.
Show full description
