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Rinthesun,
VPP (13V) is needed only to enter programming mode, should not sink too much current. If it does, when MAX enters protection mode, for 150mA at the output it will sink 460mA at the input for 85% efficiency, which won't be reach in that mode.
Plus USB section, plus PIC877 it could...
Hi Gabor (jajistenem),
At least two errors in your schematic. Firs of all the power supply for PIC18F4550 should be 5V not 3.3V. If you check the voltage/frequency diagram, 3.3V is too low even for LF4550 at 20 MHz. Second, you connect VUSB, pin 37 at 4550 to +VUSB. That's an output, internal...
pic18f oscilloscope
Hi NICK7,
I think for this type of project FPGAs are much better. You may want to take a look at this:
https://www.fpga4fun.com/digitalscope.html
Best regards,
Miti
Me again,
I did it, I built a module with PIC4550 and connected it to my serial ICD2. Works fine but sometimes fails enumeration. 100nF to GND on MCLR with 10K to Vcc makes it rock stable.
I would like to thank you all for your great job. If there's any way I can help just let me know.
Miti
Hi all,
I did a lot of reverse engineering on the ICD2 from the company I work for and I can say now that I have a very good serial clone. Looks like I have a newer version than the one I see on the picture above. It is made with MIC2145, MCP41100 and the resistors in the feedback are 10M and...
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