>paul swed: >"Hardest part is attaching the 100K resistor to the ic. Boy thats small."
I didn't solder the resistor directly to pin 5 of the IC. I found that pin 5 was connected to a nearby SMD capacitor that was a little easier to solder to. Attached is a photo of the correct location if you want to try bringing the EFC out for analog control. http://farm8.staticflickr.com/7170/6702435071_f684967719_b.jpg Where others had commented that the internal 7805 I added was running without a heatsink and would be close to max ratings, I started to worry and decided to mounted it on the heatsink that runs down the middle of the 5680A using an existing mounting hole that is used to mount a TO-220 device on the other side. The screw used to mount that device is too long so I replaced that screw with one that doesn't go quite 1/2 way through the heatsink and used an identical screw to mount the 7805 on the connector side of the heat sink. I had to elongate the mounting hole in the 7805 so it Wouldn’t interfere with the cover or the dimple in the cover where the screw that holds the cover on screws into the heatsink. The photo linked below shows the better way to mount the 7805 so you can use a single 15V supply for the 5680A. http://farm8.staticflickr.com/7157/6702428471_5a7b96068d_b.jpg -Arthur _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
