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Need help with schematic for jdm pic programmer

Discussion in 'Electronic Basics' started by Lessie, Apr 13, 2005.

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  1. Lessie

    Lessie Guest

    Does anyone know how the circuit diagram of the jdm
    pic programmer work? How is it possible that Vdd is
    connected to GND(7)??
    Please help, the circuit is here:
    www.piclist.com/techref/microchip/devprogs.htm
    about 5 screens down.
    thanks.
     
  2. Bill Bowden

    Bill Bowden Guest


    I think RTS supplies a negative voltage, so
    the PIC sees Vdd at +5 more than Vss because
    of the diode (D2). So, ground on the connector
    is actually 5 volts higher than RTS.

    -Bill
     
  3. Lessie

    Lessie Guest

    I think RTS supplies a negative voltage, so
    Hi, thanks for your reply.
    One more point, the 12V supply for programming, shouldn't
    there be a capacitor there somewhere, to smooth out the
    clock (RTS), i.e. like C1 ?
     
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