The size of the tread was 5cm by 3cm. My design, at the moment is 5cm by 3. 3cm. The basis of the regulator is taken from Walt Jung`s 1997 article Regulator Excels In Noise and Line Rejection. With a few changes based upon other Walt Jung articles on constant current sources and buffered voltages references, the schematic was born:
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At this moment, I looking for comments either on the schematic or the layout before I send it out for prototypes. I`m hoping that the layout should be fairly low noise. - the fat ground track in between the diode bridge and the output connector must be cut and replaced by a track starting at C2 ground. Nothing should be connected in between D2 and C2, it`s your dirtiest ground. - If you don`t mind being wasteful, a RC filter just after the diode bridge (something like 5-10 ohms before your first cap) quiet down the switching transients. - Q6 - a resistor might work, but then again which is quieter By designing for Q6, you can always build cheap with a resistor, but the other way around is harder. - R5, C3 - the dual resistor and cap combination is to reduce leakage current noise in the filter (taken from here: and I`ve seen in a few other places as well) what`s your current output limit based on the pass transistor i presume. also fixed voltage out one of the beauties of the lm317/lt108x circuits is some voltage adjustment. A trimmer between r3 and ground It is fixed out. But the question I would ask is how ofter do you actually change voltage of a built supply I will take a look at sizing to put a trimmer there. The other side of that though is that because the op-amp is powered from the regulated rail, some trim positions could end up in dis-functional regulator. As for current output, the limit would be CCS current of...
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