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  1. 08-09-2019 #10
    john swift's Avatar
    Lives in merseyside, United Kingdom.
    john swift
    Last Activity: 18-01-2021 Has been a member for 9-10 years. Has a total post count of 257. Received thanks 53 times, giving thanks to others 0 times.
    Hi Voicecoil

    The diagram in post 40 shows the signal path through the circuit after the HCPL-2631 opto isolators

    the only diode is within the NTR5198NL-D FET

    hence my comment in post 30

    “Its a pity they had not used a DIL (dual in line ) octal transistor array like the ULN2803
    or a new FET array
    like the Toshiba TB D62381A series DMOS transistor array
    that would enable the user to plug in a replacement “

    the Gecko G540 has the same issue with a FET that's soldered in

    John
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