Rett og urett på havet, hvor er Evensen ? Er det oscillasjoner i sjøkabel da ?
1. isolate the op-amp output from capacitive loads with a 50 ohm resistor in
series with the output (but take the feedback network directly off the op-amp
output. This will stop oscillations due to cable
capacitance.
This practice, unfortunately
is why cables sound different. Depnding on the intentional source resistance or
lack thereof interacting with load capacitance, the op-amp's behavior at high
frequency changes. Use an op amp that doens't get pissed with capacitance, or put
a high-current buffer inside the feedback loop with it, you'll get a preamp that
doensn't care what cable you've got hanging off it. Much like a top-notch
discrete design.....