Vox (voice operated tranmitter) circuit for digital modes like FT8

Older transceivers do not have a VOX circuit. Such circuit can be very handy in case of use with digital modes. Then the audio signal of the laptop/notebook switch the transmitter on and back to receive. This circuit is in use with my home made 6 mtr. transceiver, my FT-7 and FT-726R. Running WSJT-X on an old laptop (with Xubuntu) performs very well.
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