Search found 15 matches

by danak6jq
Fri May 22, 2020 3:48 am
Forum: Hardware
Topic: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong
Replies: 17
Views: 4637

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

Horst Schlawutzke wrote:
Thu May 21, 2020 8:02 pm

Dana, my hero!
(probably the best answer I ever got from a forum)

regards Horst
Aw, you'll make me blush! I'm glad that I could help.

Cheers,
Dana
by danak6jq
Wed May 20, 2020 6:31 pm
Forum: Hardware
Topic: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong
Replies: 17
Views: 4637

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

It's true the PCB has no silkscreen; fortunately, the "ESP32-LyraT Getting Started Guide" contains a link to a component layout: https://dl.espressif.com/dl/schematics/ESP32-LyraT_v4.3_component_layout.pdf Locate and remove C62, C64, C65 and C66. It is perhaps easiest to find these initially using ...
by danak6jq
Wed May 20, 2020 3:34 pm
Forum: Hardware
Topic: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong
Replies: 17
Views: 4637

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

bobolink wrote:
Wed May 20, 2020 11:31 am
I’m interested in this topic as well.

Dana,
Does the AI-Thinker board have these parts?

Bob
I can confirm that the AI-Thinker dev boards that I have, do not have these parts.

Cheers,
Dana
by danak6jq
Wed May 20, 2020 3:33 pm
Forum: Hardware
Topic: ESP32 LyraT v4.3 Aux input circuit is highly confusing and surely wrong
Replies: 17
Views: 4637

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

Hello there and thnks for the topic, in order to remove the caps, would you hint me to locate them? I can't find a pcb layout, so in the moment I am stuck. It's true the PCB has no silkscreen; fortunately, the "ESP32-LyraT Getting Started Guide" contains a link to a component layout: https://dl.esp...
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: 17
Views: 4637

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: 2649

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: 17
Views: 4637

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: 17
Views: 4637

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: 17
Views: 4637

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...

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