100DP1T1B4M7RE
100SP3T1B4M7QE
these are the switches I used, they are not often available, but most right-angled dpdt and spdt switches should do the job.
the footprint for an LL1528 transformer (or LL1935 in reverse) was put there in case people would like to use a low impedance input compared to the 50kOhm of the ina134. I'm sure you could wire in an original Shure microphone input transformer.
100SP3T1B4M7QE
these are the switches I used, they are not often available, but most right-angled dpdt and spdt switches should do the job.
the footprint for an LL1528 transformer (or LL1935 in reverse) was put there in case people would like to use a low impedance input compared to the 50kOhm of the ina134. I'm sure you could wire in an original Shure microphone input transformer.