Tack Jansch för all bra info
En till kanske dum fråga till dig:
Skulle en sån här spole på + ledaren som går till högtalaren , 5 cm från kretskortet ( jag delar den röda plus-kabeln och löder in den ) kunna förbättra prestandan från Lm 3886 i t amp 40c ? Dvs förhindra oscillering ?
56 nH
Ca 12 kr st på elfa.
Den skulle kunna sitta i denna lilla plastlåda från Kjell.
Kombinera denna med ett motstånd på 10 ohm?
https://www.elfa.se/sv/luftspole-smd-56 ... track=trueJag ser på en annan sida om Lm 3886 att filtret med fördel kan sättas vid högtalarterminalerna istället?
http://www.circuitbasics.com/design-hi- ... -Inductors”While the Zobel network reduces oscillations caused by inductive loads, the Thiele network reduces oscillations caused by capacitive loads, usually due to long speaker cables. It also prevents radio frequencies picked up by the speaker wires from getting back into the amplifier’s inverting input through the feedback loop.
Inductors have a low impedance to low frequency current and a high impedance to high frequency current. Audio signals are relatively low frequency, so they will flow through the inductor uninhibited. High frequency oscillation current will be impeded by the inductor and be forced to flow through the resistor, which will dampen it.
The datasheet recommends a 10 Ω, 5 Watt resistor in parallel with a 0.7 µH inductor. In a stereo amplifier, there will be one Thiele network per channel. They should be located away from the amplifier’s input circuitry to prevent interference from the magnetic fields generated by the inductor. A good location is near the speaker output terminals, separated a bit or at 90° angles to each other to prevent magnetic field coupling between them.