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  1. 07-12-2010 #36
    BillTodd's Avatar
    Lives in Colchester (nuked in 1984), United Kingdom.
    BillTodd
    Last Activity: 01-01-2021 Has been a member for 9-10 years. Has a total post count of 437. Received thanks 17 times, giving thanks to others 1 times. Referred 1 members to the community.
    Hmm. -4v seems low, but if it works... I know I'm abusing the serial port, but I've used this circuit many times may be the prolific device is different to mine???

    BTW are you driving it from a PC or laptop? (laptop USB ports seem to lack the ooomph required for most USB devices)


    You could try sticking a 10u cap between the DTR line and Vss just to stiffen the -ve rail a bit.

    Bill
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