so I have written out all of the combined resistors and the capacitors for the series of frequencies you provide from 45 to 7000 hz took a while may sound stupid because its really novice but what are the type of capacitors in the buffer circuit (they're not polorized)
so here, how do I set the gain so that the millivolts from the signal is enough to be read by the lm3914
also if you can remind me how to link a power supply to the filter circuit power without connecting with leads I've forgot REF too
I'm going to build two, one that have the 45Hz to 16kHz because I have the parts now, and one 45Hz to 6000Hz need to space correctly though normally I use chatgpt for the spacings but its just spitting out BS at the moment
before the diode and after the signal = red
after diode and before cap and resistor = green
after capacitor = turquoise
signal before diode (red) after cap (turquoise)