There might be a stability issue when introducing capacitive loads. This is seen on one of Dave's EEVBlog videos about the uCurrent (https://www.youtube.com/watch?v=1VlKoR0ldIE).
The issue seems to be a design mistake. Which is the output 270 Ohm resistor being INSIDE the feedback loop of the last amplifier. When capacitance is introduced on the output, it will create a big phase shift (depending on the capacitance value) and can make the amplifier oscillate.
The solution is to simply remove the 270 Ohm from inside the loop and place it directly on the output before the binding post.
For people that already have Dave's uCurrent or the tinyCurrent version, the easiest fix is to remove the 270 Ohm resistor, bridge the pads, make a small cut on the output track going to the binding post and solder the 270 Ohm there.
There might be a stability issue when introducing capacitive loads. This is seen on one of Dave's EEVBlog videos about the uCurrent (https://www.youtube.com/watch?v=1VlKoR0ldIE).
The issue seems to be a design mistake. Which is the output 270 Ohm resistor being INSIDE the feedback loop of the last amplifier. When capacitance is introduced on the output, it will create a big phase shift (depending on the capacitance value) and can make the amplifier oscillate.
The solution is to simply remove the 270 Ohm from inside the loop and place it directly on the output before the binding post.
For people that already have Dave's uCurrent or the tinyCurrent version, the easiest fix is to remove the 270 Ohm resistor, bridge the pads, make a small cut on the output track going to the binding post and solder the 270 Ohm there.