If you run into issues, note that many clones have problems with poor choice of substitute OPAMP U2 in the target Vdd regulator which *must* be true RRIO, and handle a supply voltage range of 4.5V to 6V, P-MOSFET Q1, the Vdd pass transistor which must have a low Vgs threshold, and the Vdd switch dual MOSFET U5 which again needs low threshold voltages, and a low enough Vds_on for its PMOS half to avoid excessive voltage drop under load.
Diy pickit 3 upgrade#
However I would suggest taking the opportunity to fully upgrade your clone for variable Vdd support. For non-HV programmed PICs you'll need another instance of the per line part of the clamping circuit to limit Vpp/MCLR to 3.3V. If your PICkit 2 clone omits the clamping circuit for reduced target voltage support, it can be added externally, copying it from the PICkit 2 schematic. Assuming 'fchk' is correct and that PIC24 doesn't use HV programming (I haven't checked its datasheet), then (2) is irrelevant, (but see clamping below). If your PICkit 2 clone doesn't have 3.3V Vdd support don't connect PICkit 2 target Vdd to the target ICSP interface. If the target is externally powered, (1) is irreverent. The clamping circuit for PGC, PGD and AUX may be missing or non-functional, which will over-volt the signal lines of the target's ICSP interface.
Diy pickit 3 generator#
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