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JDM PIC programmer

Discussion in 'Electronic Repair' started by [email protected], May 13, 2007.

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  1. Guest

    A while ago I came across a schematic for a slightly modified JDM PIC
    programmer which I just finished building. Unfortunately using it with
    IC Prog did not yield good results- even though Vdd and MCLR voltages
    are present, I am only getting blank data when trying to read/write a
    16F84A chip.

    * What other signals should I be checking and what are the expected
    values ?

    * What are reliable settings in IC Prog ?

    * Does the schematic look correct? I compared it with the original
    design and noticed a 2.2k instead of 1.5k resistor and the transistors
    are different, though they seem to have similar specs :

    Thank you!
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