Its a one off spare parts project using a chip I found in my box so I'll include it as an experiment, its kind of exciting doing things that I've not done before.
Bet its been a while since most people here have gotten excited about an output inductor
Could I use a 10 ohm 1/10th watt resistor to save space or is that likely to get too hot?
I guess I'll just use 1/4w and stand it upright, should only take 2 hole spaces wide in the tripad board then.
Remember that its only a 1w TDA2822m chip amp being powered with 12v max and not a big 50w hifi system.
Nonsense.
The typical Zobel resistor is 10 ohms.
Some go as low as 1 ohms.
So no need to overworry about "ultra low impedance"
Whether you place it across speaker out and ground pins at a chipamp footprint or across speaker out connector 2 to 4 inches away is the same,the possible 0.02 ohm or lower resistance in between will not matter.
Possible significant cable capacitance will mean something at least a few meters away, definitely not centimeters away.
As of being on one side or the other of an output capacitor, if it has zero impedance, either side is the same by definition; if it has significant impedance then it will be isolating cable capacitance on its own, so it´s clear that it´s not a problem by itself.
I think you have got your capacitance and inductance mixed up.
If you want the Amplifier Output Zobel to effectively load the output at frequencies approaching RF then one needs ultra low impedance.
Guys, I think some of us are getting confused.
By zobel network I'm only referring to the Boucherot cell as shown in the example circuits of the datasheets and not the optional extras that many people here include.
Non of my speakers have any extra components across the terminals so all of the HF filtering is done on the circuit board by the RC Boucherot cell at the output of the chip.
So just to confirm its better to put R3, R4, C6, C7 before C4 and C5? That is connecting directly to pins 1 and 3 and ground.
They are through hole carbon film and are about half the size of regular 250mW resistors, usually found in cheap Chinese equipment which is where I pulled them from.
By zobel network I'm only referring to the Boucherot cell as shown in the example circuits of the datasheets and not the optional extras that many people here include.
Non of my speakers have any extra components across the terminals so all of the HF filtering is done on the circuit board by the RC Boucherot cell at the output of the chip.
So just to confirm its better to put R3, R4, C6, C7 before C4 and C5? That is connecting directly to pins 1 and 3 and ground.
They are through hole carbon film and are about half the size of regular 250mW resistors, usually found in cheap Chinese equipment which is where I pulled them from.
Neither you nor the Members are confused. The Amplifier Output Zobel is the R+C placed on the Output of the amplifier.
The R+C is the amplifier output Zobel
Almost no manufacturer/Designer offers a power amplifier that is stable for all loading conditions and omits the Output Inductor. I know of at least one Designer mentioned in this Forum that does omit this stability component. But they are probably alone in doing so.
In my (amateur) view the output inductor is not an optional component. Low current outputs can save money by replacing the damped inductor with a single resistor and you will often see this recommended in opamp datasheet and ap notes.
Then that points to penny pinching and hoping not too many come back under warranty
You got four Members' replies confirming this.
don't use those tiny carbon film resistors.