pork barrel MN3207 MN3007

[darrenw6000]

with the extra pins that are on the board, normal pinout of an MN3007 is that pin 1 is ground and in this circuit the added pins would send voltage to pin 1.

[madbean]

That's because it is a negative ground circuit. MN3007 were designed for positive ground. When you use +dc you have to flip power and ground on the BBD. Check out the CE-2 schem and you will see the same thing.

http://www.hobby-hour.com/electronics/s/schematics/boss-ce2-chorus-schematic.gif

[darrenw6000]

so the mn3207 is for standard negative ground circuits

[madbean]

Correct. In general, the MN320x is the lower-voltage negative ground version of its MN300x counter-part. Both can be used for negative ground circuits, however.

[darrenw6000]

Also in that schematic there appears to be N channel JFET(Q9) is that just something to do with how Boss did the LED switching?
Also on there looks like the output is coming from pin 1 of IC1 but on the pork barrel schematic its coming from pin 7,

[somnif]

Also in that schematic there appears to be N channel JFET(Q9) is that just something to do with how Boss did the LED switching?
Also on there looks like the output is coming from pin 1 of IC1 but on the pork barrel schematic its coming from pin 7,

Correct on the boss-style switching. http://www.geofex.com/Article_Folders/bosstech.pdf  I've always presumed they went with this set up due to the cost of mechanical switches (saving a few cents a box adds up I suppose) but maybe those wacky Roland engineers had some other logic in mind.