stefaudio

Thanks for the reply. That's a helpful post as well! Nice project BTW!!!

I used this 12v 5A Switching Power Supply to feed the barrel connector on this Stereo 20W Class D Audio Amplifier. I replaced the included power supply capacitor with a low-ESR aluminum-polymer capacitor. I used the power supply screw terminals...

Lightbulb moment. The real issue it seems has been, the amplifier I was trying to use which is really not very high quality, and my inappropriate expectations of performance of that implementation. I tried an experiment. I have a SONY SRS-X3...

Very interesting. So you are saying you used this amp fed with the line-out of a Teensy Adapter board; the 12V brick powered the amp, and from the amp, you jumpered over to some 5V regulator to power the Teensy? Can you provide me with the...

Would something like this 2.5W mono amp work for you? I've used a Class D amp in a project, only using the stereo outputs of a Teensy 3.6. I powered a 20w stereo class-D amp with a 12v wall brick, and used a 12v to 5v regulator to power the...

In a small metal enclosure, I wish to place a DSP noise reduction and morse code decoding circuit built around the Teensy 4.1 and accompanying Audio Adapter; see https://github.com/grahamwhaley/DSPham/blob/master/README.md to be used with SW...

MarkT - thank you for the time and effort spent in your reply. Very helpful and appreciated. How then would you recommend to someone like myself that they go about getting the processed audio signal off the Audio Adapter board and into a...

Mark, thanks. I was also considering the use of a linear optocoupler like the following: https://www.vishay.com/docs/83622/il300.pdf That should have significantly higher bandwidth than a 1:1 isolation transformer. As an Amateur Radio Licensee...

Line level isn't designed to drive 600 ohm loads (no one uses 600 ohm in audio these days) but may be able to (check SGTL5000 datasheet for this). Balanced signal cables are used professionally to avoid any ground loop issues, but with...

It is hard to generalize, but for the circuits that I build, I don't think I would stack above or below an MCU board, unless there was really very good shielding and very good power filtering. The best thing is make a PCB with a footprint for...

@ Well, I definitely appreciate the response. On the 4.1 board, is that connection between VUSB and VIN (at those pads) common to one another, unless I mechanically cut it? So, then I need to cut that connection between the pads if I want to...

I'm dealing with a similar problem. I've got a pretty decent signal coming off a 4.1teensy compatible audio board (I think rev D), and going into a pair of SONY headphones and being subjectively judged by my simple brain. But it's not ideal for...

If power is from a USB cable, please know the USB 2.0 specification in section 7.2.4.1 "Inrush Current Limiting" on page 177 requires USB devices have no more than 10uF direct capacitive load. Teensy 4.x already has about 2.6uF directly...

I have a little speaker with a pam8403 amplifier. I also have a teensy which is outputting audio through the audio shield. When the teensy and the speaker are powered by different batteries, it works fine - the speaker plays the audio as...