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#21
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Ken Scharf wrote:
I'm going to use it on Linux with PikDev. I use Jaakko Hyvatti's version of the JDM84 with picprog software. It works very well on Linux. http://www.iki.fi/hyvatti/ 73, Ed. EI9GQ. -- Remove 'X' to reply by E-mail. Linux 2.6.5 |
#22
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Ken Scharf wrote:
I added a diode in series with the VPP output from the emitter or Q1 (with the anode toward Q1's emitter) and a second shut diode from the MCLR pin to VSS (anode toward VSS). Now the VPP voltage at MCLR swings from -0.05v to +12.6 volts. I hope that's enough VPP. I may have to change out the 8.2v zener, I measured the voltage across it and it appears on the low side. I could also just connect a 1n4001 or two in series with it to raise the vpp supply. Anyway seems the programmer is safe now. Still need to put a scope to the PGC and PGD lines and check they are in spec. When I modified my PicStart Plus Microchip specified the voltage should be 12.75-13.25. Microchip had a mod to lower the voltage from nominal 13.75 to nominal 13.0 for the newer chips (new about 7 years ago). |
#23
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Ken Scharf wrote:
I added a diode in series with the VPP output from the emitter or Q1 (with the anode toward Q1's emitter) and a second shut diode from the MCLR pin to VSS (anode toward VSS). Now the VPP voltage at MCLR swings from -0.05v to +12.6 volts. I hope that's enough VPP. I may have to change out the 8.2v zener, I measured the voltage across it and it appears on the low side. I could also just connect a 1n4001 or two in series with it to raise the vpp supply. Anyway seems the programmer is safe now. Still need to put a scope to the PGC and PGD lines and check they are in spec. When I modified my PicStart Plus Microchip specified the voltage should be 12.75-13.25. Microchip had a mod to lower the voltage from nominal 13.75 to nominal 13.0 for the newer chips (new about 7 years ago). |
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