Hi Olin, > The extra 400mV difference between the PIC power and > that of the rest of the circuit is probably not > important, but it's your circuit and only you can > answer that. It's likely a bad idea if you are using > the PIC A/D with Vdd as reference. I plan on using 1 pin as an A/D and I have no external reference. However, the absolute value is not really important. I'm using it to connect +- 8 pushbuttons to 1 pin, so I guess it should be OK. > Is this a commercial product? No, it's a controller for a 7.1 channel preamp I'm trying to make. You can see some details about it here on my site: http://members.lycos.nl/anthonyvh/index.php?page=preamp-main > For hobbyists, this can be solved by the EasyProg programmer. I'm using the PPWin programmer (http://www.semis.demon.co.uk/Pics/PICmain.htm), but this is the first project that I'm using a PIC for (amongst heaps of other things I use for the first time, I'm crossing my finger that it will work), so I don't know if it could handle the capacitance on the board. Anthony * I got one very stupid question for which I certainly don't want to send a separate mail to the list. It'd be cool if someone helped me out. Ok, here goes (attention, stupid question ahead): to protect the controller board from damage, I'd like to include a zener in the circuit (which probably won't be necessary at all, but I guess it's better to be safe than sorry). Can I just connect it between the +5V & gnd or should it be like: +5V -> low value resistor -> circuit & zener? I don't quite know how much current the circuit will need, although it shouldn't be more than 1A (probably even less than 0.5A, but the 1A figure is just to be safe). ===== Website: http://members.lycos.nl/anthonyvh __________________________________ Do you Yahoo!? Yahoo! Mail Address AutoComplete - You start. We finish. http://promotions.yahoo.com/new_mail _______________________________________________ http://www.piclist.com View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist