This pandemic is going to drag for sometimes, and since the B1 R2 is a very low power circuit device, I am interested to make one with +/-12V battery powered version with 6 x 18650 3.7V batteries, no regulators, no input/output caps, as straight forward as possible. 😀
Any unbalance between pod and neg voltages in the power supply will result in dc on the output. Keep that in mind when using batteries or use a cap on output.
I'm trying to understand what you mean since all voltages on the output of the power supply are DC, and the trimpot is meant to remove any DC offset?
If the rails (+/-12V for example) decreases by battery end-of-life by the same voltages, to e.g. +/-10V and further down, that’s ok. But if one start to decline before the other so that you have +12V and -10V you will have a DC voltage on the output.
If a single battery discharge s more than others, you will have DC at output. I'd change output 100ohm Res with a cap in case of battery operating ps
Does this DC offset at output due to differing +/- PS rails imply that DC offset can be dialled out by deliberately varying the + or (-) PS rails? Would that be a way of using 'mismatched' jfets and avoiding output caps?
I have too much gain in my system so I am thinking about using the B1 rev2 instead of the BA-3 pre I am using today. My PSU is +/-24V. Noticed that in the M2x this buffer is used with +/-24V so it should work, right? Or is there some difference I am not spotting?