Search found 11 matches

by danak6jq
Thu Oct 10, 2019 3:38 am
Forum: Hardware
Topic: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong
Replies: 10
Views: 1155

Re: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong

Thank you - I'm looking forward to more information.

Cheers,
Dana
by danak6jq
Sat Oct 05, 2019 5:49 am
Forum: ESP IoT Solution
Topic: Amazon RTOS
Replies: 5
Views: 935

Re: Amazon RTOS

I don't speak for either Espressif or AWS, but I'd say, compare schematics, look at the pin connections. Odds are the Amazon FreeRTOS works on the Espressif boards based on the ESP32 modules. Note that Amazon FreeRTOS is based on FreeRTOS v10 and does not yet include the Espressif SMP extensions, so...
by danak6jq
Sat Oct 05, 2019 5:45 am
Forum: Hardware
Topic: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong
Replies: 10
Views: 1155

Re: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong

Anything? I suppose no one uses that line-in circuit, eh? It's quite broken with those caps.
by danak6jq
Wed Sep 25, 2019 9:01 pm
Forum: Hardware
Topic: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong
Replies: 10
Views: 1155

Re: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong

ESP_Sprite wrote:
Mon Sep 23, 2019 4:14 am
Agree that these components look out-of-place - I've asked someone on the hw team to figure out if these components have a use.
Any update? I removed C62, C64, C65 and C66 and now I've got a very decent line-in sound-card :-)

Cheers,
Dana K6JQ
by danak6jq
Mon Sep 23, 2019 7:16 pm
Forum: Hardware
Topic: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong
Replies: 10
Views: 1155

Re: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong

To confirm, I removed C62, C64, C65 and C66 from the board, and now I see good separation between left and right aux in, and equal amplitude (within < 0.01dB) between the two channels. Before, right channel amplitude was substantially reduced by the additional loading by C66. I do not understand the...
by danak6jq
Mon Sep 23, 2019 4:57 pm
Forum: Hardware
Topic: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong
Replies: 10
Views: 1155

C66 has to be wrong, too (was Re: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong)

C66 is effectively from a DC bias slightly lower than Au_VCC33, coupled to ground via 10uF. It looks completely wrong for capturing audio.

Cheers,
Dana K6JQ
by danak6jq
Mon Sep 23, 2019 1:57 pm
Forum: Hardware
Topic: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong
Replies: 10
Views: 1155

Re: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong

Thank you for looking into this. I also do not understand the purpose of C66 and expect it would also reduce the audio quality of the right input. I understand that R78 / R132 is for Aux Detect (detect when a connector is plugged-in to the jack), R107 is intended to load the right input the same as ...
by danak6jq
Mon Sep 23, 2019 12:23 am
Forum: Hardware
Topic: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong
Replies: 10
Views: 1155

ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong

The Aux input from the 3.5mm Aux input jack has a 0.1 uF capacitor from left channel to right channel (C62), as well as 0.1u caps shunting each of the left and right inputs to Au_ground (C64, C65). This seems really wrong for audio input processing. Anyone have any idea why? I'm about to look at the...
by danak6jq
Mon Sep 23, 2019 12:18 am
Forum: ESP32 IDF
Topic: How to configure LyraT v. 4.3 board to sample audio data from AUX input?
Replies: 4
Views: 566

Re: How to configure LyraT v. 4.3 board to sample audio data from AUX input?

If I understand correctly, you're using the esp-idf example i2s_adc_dac, which uses the internal ADC and DAC and does nothing to interface with the ES8388 codec on the LyraT 4.3 board. What you need to do is configure the ES8388 codec via i2c, configure i2s 0 for the desired sample rate, and then us...

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