I'm making some audio filter circuits, using 1% resistors and capacitors.
Capacitors only available in 22n, 33n or 47n cheaply, so I use them in combinations to get a reasonable impedance points. One filter would use three caps in series -- what happens to the DC isolated nodes on the series connected capacitors here?
Would you put a high value resistor, 10M or something, across caps in series? I recognise the need to balance DC midpoint with electros in a power supply, but what of signal nodes around an opamp?
Around one opamp I have three in series caps to ground, two in series on the feedback (8.25n and 16.5n from 22n and 33n caps).
Anyone have a horror story of what happens if one leaves these nodes 'floating' DC wise. Or do nothing at all, board leakage will fix it?
Thanks, Grant.