Zeners on the JDM

[Jidis]

Hi,

I etched a JDM board and had everything but the 8.7(or 8.2) zener diode on hand. I found a 9.2 and a 7.something, but nothing in the eights. Is it safe to go up or down a value, and if so, which one?

If not, I've been using a Willem. I just want one for home. :)

-Thanks!

[moogah]

I'm not an expert, but I've read most everything here about the JDM.  Some users couldn't get theirs to work untill they used a 9.1v Zener.  I'd hook it up and check your voltages, thats all that really matters anyway.

[Jidis]

Moogah,

Thanks! - That's weird, that is almost what I put on there. I blew an 18f452 with the bootloader and MIOS1.8, as well as erasing it, reading it and verifying it successfully. I did everything except use the chip in a MIDIBox ;D

It looks fine, but I didn't get the 13.7v in the MCLR test at pin 1. It was something in the high 12 range (maybe 12.9v) and that "delay" fader was at minimum. The Vss/Vdd test was a fraction lower than 5v as well. I'm not sure what the tolerance is on this stuff, but I do have a backup programmer.

-George

PS- I think 9 pin "straight-through" cables with most of the lines connected need to be on the endangered species list.