I have asked about the same theme at Stack Exchange (here). I just wondered if there might be some alternative answer here.
I am going to listen to some sound from inside my DSP software that I'm routing out to a headphone / headset / earphone just to hear what's in there. After that stage the data goes into the DSP SW, like FFT. (Much of it is described in a blog note, here (no ads or income from my notes, I'm retired and it's a hobby)).
I need a digital input headset output amplifier. Class-D or analogue for that matter. The Adafruit breakout board 3006 (here) uses a Maxim MAX98357A D-class amplifier (here) - which more or less is the only one I found. (Strange?) It's small and ok price and power consumption for me.
It sounds like I could connect that directly to a headset, without having to complicate with an extra coil there? I found a thread here (Inductance of Headphones. Has anybody measured? - which actually brought me to this forum) which seems like I don't need to worry. I need mono and each coil of my Plattan 2 directly coupled is 50 Ohm. So I'd have 25 Ohm plus the inductance of the headset. The Adafruit board also has ferrite beads and two 220 pF caps at the wires.
Does this sound ok, or would there be any better ideas?
(Edit: The ATOM Speaker Kit (with NS4168) also has a headset output. I'd assume it would work without the speaker. But I did not find a circuit diagram or any other data sheet for the NS4168 than in Chinese.)
Øyvind Teig, Trondheim, Norway
I am going to listen to some sound from inside my DSP software that I'm routing out to a headphone / headset / earphone just to hear what's in there. After that stage the data goes into the DSP SW, like FFT. (Much of it is described in a blog note, here (no ads or income from my notes, I'm retired and it's a hobby)).
I need a digital input headset output amplifier. Class-D or analogue for that matter. The Adafruit breakout board 3006 (here) uses a Maxim MAX98357A D-class amplifier (here) - which more or less is the only one I found. (Strange?) It's small and ok price and power consumption for me.
It sounds like I could connect that directly to a headset, without having to complicate with an extra coil there? I found a thread here (Inductance of Headphones. Has anybody measured? - which actually brought me to this forum) which seems like I don't need to worry. I need mono and each coil of my Plattan 2 directly coupled is 50 Ohm. So I'd have 25 Ohm plus the inductance of the headset. The Adafruit board also has ferrite beads and two 220 pF caps at the wires.
Does this sound ok, or would there be any better ideas?
(Edit: The ATOM Speaker Kit (with NS4168) also has a headset output. I'd assume it would work without the speaker. But I did not find a circuit diagram or any other data sheet for the NS4168 than in Chinese.)
Øyvind Teig, Trondheim, Norway
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I also see the soon to be discontinued WM8731 (from Wolfson, now Cirrus) is used on the obsoleted Sparkfun Arduino Codec Shield and the still available MikroeE Audio Codec Board – PROTO MIKROE-506. It uses a charge pump based headset ampifier. Cirrus suggest to replace the WM8731 with WM8904, which also has that charge pump. I think that direction is way too complex for my hobby project. I already have mics. Besides, I couldn't find any breakout board with the WM8904 either.