L
Lostgallifreyan
- Jan 1, 1970
- 0
The circuit board may add less
This is useful. It's why I think it's current-induced, but I'll think more
on this. While it's not causing bother with the regulator (tested with
standard 78S05 too, same results), there might be some other aspect where
that tiny current difference between pinboard contacts and soldered
connections makes a difference. The error is in the mV range as it is. I
might try a 1 ohm resistor between the gain stage ground and the meter
input ground, but it will have to wait. It was not a happy occasion, 16
hours straight and I snapped at the end, bust up the box and all. I'll get
some more pots and make up a new gain stage soon (got three boards left of
four). I won't be trying that same small box again though, whatever else I
do, so the problem might not re-appear, given that that box was where it
happened. The easiest guaranteed answer seems to be to use a PLASTIC box.