Re: [EE] DAC-to-headphone-level output amp
Neil <[email protected]>
| Newsgroups | gmane.comp.hardware.microcontrollers.pic |
|---|---|
| Message-ID | <[email protected]> |
Yes, will try this. Thanks On 12/19/2024 7:59 PM, [email protected] wrote: > For a one off I would try direct drive the BLE from the DAC via a 10uF capacitor and work out where to go from there. > > > Cheers, > Martin. > > > On Friday, 20 December 2024 at 09:58, Neil <[email protected]> wrote: > >> I'm designing a one-off device for myself that will generate audio from >> a microcontroller and I want to send that audio to a small BLE audio >> transmitter (something I picked up on Amazon). >> The BLE transmitter has a 3.5mm headphone plug and they specify it's for >> "Aux" level devices, but works very well when plugged into my PC or >> cellphone, so I take that to mean headphone level. >> FWIW, the audio signal is mono, but I want to drive both left and right >> channels. >> >> Researching online gets me a whole lot of different answers -- >> everything from line level being 10k ohms input impedance and 1V or 2V >> to 3V and headphone level is 8 to 600 ohms, with voltage level from 0.3 >> to 0.8V (though I would've expected headphone level to be higher since >> it's amplified). >> >> Can anyone shed some light on this please. I'm unsure what I'd be >> designing for... should I just do an op-amp with a very low output >> impedance and adjustable volume until it sounds decent? Or is there a >> spec I should follow? >> Alternately, I'd be happy if there's some simple monolithic chip that >> would do this for me (take a 0V-3.3V audio signal from a uC DAC and >> convert it to headphone level audio). >> >> Cheers, >> -Neil. >> >> >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> https://mailman.mit.edu/mailman/listinfo/piclist