DIY micro tower (desktop version)

>>21908843
Interesting option.

>>21909592
First and foremost, convenient (no 'playing' with flash and reset buttons) . And in principle there is nothing revealing here. Webupdate already worked on the older brother ESP8266.
On the radio, the button only switches to AP mode after the first boot to enter WiFi credentials. After restart, this page is displayed on the local IP of the network the radio is running on. Any changes to the firmware can be uploaded this way. Once uploaded, the ESP reboots itself.

New test soft for the Spectrum. Compiled version (.bin) for quick upload via webupdate.
- improved saving of last selected theme;
- improved colours in motifs 6 and 7;
- additional VU motif;

Krzysztof Kamienski wrote:

Nice work and as a reward I am adding a pack of triptychs.

Unfortunately the triptychs did not arrive....

But for sharing the project and publishing it, I received a gift from @gulson (System Administrator).

Fuck the trrites 😀

You deserve such a gift, you deserved it.

Greetings....

I'm looking for new solutions for a willow micro amplifier.
I am not very proficient with audio experience.
I came across the TDA7313 circuit. An interesting chip. It has pretty much everything a mini preamp should have.
Tone, balance, volume and even a three input selector.
It is controlled via i2c.
Does anyone have any practical experience with it?

I used to use the TDA7318, it's the same family as the TDA7313. The TDA7318 has four inputs and the 7313 has three inputs.
Generally it's quite an old development, once often used in micro-towers and car radios. Probably even designed with car radios in mind, as they support four outputs ( stereo-front + stereo-back).
The circuits themselves in terms of sound quality are not outstanding, let's say rather so-so. But, after all, looking at the truth, they were designed for average, standard applications. But you have to give them credit for offering quite a few features and in this respect they are worthy of consideration.

>>21912735 I have also just come across it (in another thread) and unfortunately have not found it on offer from any reputable supplier.

And the design - first class

@tytka Thanks for the information.
I have three of these willows to make and don't want to mess around with discrete components
The recipients are not audiophiles, so maybe it will be ok

marweg1967 wrote:

Unfortunately I could not find it in the offer of any reputable supplier.

You can buy one for pennies from a Chinese supplier, but what is it actually?
I'll order and see how it plays....

marweg1967 wrote:

A projection - first class

Thanks

efi222 wrote:

You can buy one for pennies at the Chinese but what is it actually...?
I'll order and see how it plays...

Well yes, on Ali £23 for 10 pieces "made in Korea". At least the pin count seems to match If you actually buy and try it out please share your impressions.
Some time ago I saw this IC in LCSC and in fairness it was stated that some Chinese manufacture was producing it, but I wasn't interested at the time and then forgot about the issue. Now I have checked and they don't have it, not even the 'clones'. The supplier itself seems reliable to me. It's not always cheaper there than, for example, at Mouser, but I bought something from them several times and never got nicked, including original STM32s for half the European or American price. In any case, the programmer detected them as originals and that's how they behaved.

marweg1967 wrote:

on Ali £23 for 10 pieces "made in Korea"

The originals will probably be gone by now.
Chinese LM1036s are said to "play" like the originals.
So there is hope. I have 5pcs of TDA7313 in my shopping cart for 16zl.
I will order tomorrow.

Added after 11 [hours] 1 [minutes]:

@marweg1967
I ordered one of these:
The most interesting thing is that I gave the numbers from the AI chip and she replied that it was an STMicroelectronics product with a 1999 chip

Consider that AI often lies.
Besides the numbers they could have given such Chinese do whatever they want, they fake everything.
Greetings...

efi222 wrote:

The most interesting thing is that I gave the numbers from the AI chip and she replied that it was an STMicroelectronics product with a 1999 chip

So the pattern for the engraver ja ta lala

I think I'll also buy one for myself when I buy another Chinese. If it doesn't work out, I'll get over the loss of PLN 15.

The DS of this TDA7313 reads.
The timbre is in 15 (in 2dB increments) steps. Volume in 63.
While the volume could be controlled from a potentiometer on the ADC of the control MCU, the timbre is more likely to be controlled by an encoder due to the number of steps.
When the TDA arrives it needs to be tested.
In the meantime I will prepare some test soft.

I have a slightly different suggestion. TDA8425 HiFi class, i2c control, used in WS 502 etc. Diodes; https://media.digikey.com/pdf/Data%20Sheets/NXP%20PDFs/TDA8425.pdf You can add TDA1029 as input selector.

ArturAVS wrote:

I have a slightly different proposal. TDA8425

I have taken a cursory look at the DS. It even has a dual input selector.
As luck would have it, it will be next in line for testing . It's available from the Chinese for a pittance.
I'll order in my next collection of purchases.

The selector on this TDA can be used to switch between FM/internet, for example.

I have used the TDA7318 in several projects, always changing all the settings with the encoder.
One project I even presented here years ago ( Link )

I have also used the TDA8425. It is slightly better than the TDA7318, but (in my opinion) only slightly, as overall it also leaves a lot to be desired. It has a selector for two inputs, pseudo-stereo and super-stereo effects.
And the fact that it was used in Dior's WS-502 is unfortunately not its trump card. The truth is that it is a rather uninteresting amplifier. It's already the AWS-504 with a selector on the CD4052 and a completely analogue tone, that sounds more interesting.

............................
p.s
One more curiosity.
For the TDA7313, or TDA7318, you can additionally use the TDA7317 chip, which is a 5-band equalizer. And if that's not enough, you can use two such chips, adjust the filters accordingly and a 10-band equalizer is ready

Quite interesting cubes of a similar type were once also made by Mitsubishi Electronic, a whole series of M624xx circuits. Many of them could be found, for example, in Technics mini-towers.

tytka wrote:

In addition to the TDA7313, or TDA7318, a TDA7317 chip can be used

By the way, I found an impressive list of TDA chips for audio on Elektroda.
Only, it's almost a quarter of a century since the dating of this article.... ...
https://www.elektroda.pl/rtvforum/topic23168.html#125812

Added after 20 [minutes]:

tytka wrote:

One project I even featured here years ago (Link)

I have read it all. As usual "professional" when it comes to execution.

efi222 wrote:

Only that it's almost a quarter of a century since this article was dated.... ...

Well, look how time flies.
And at my place, somewhere in a drawer probably still to be found (original) TDA7318 and TDA7317, TDA8425, some from the M624xx family....

tytka wrote:

somewhere in the drawer you will probably still find the (original) TDA7318....

Well unfortunately most of my electronic resources were lost in the early 90s. Anyway, I didn't worry too much about it as I rather didn't plan to continue constructing in this area.
An unexpected return to the 'addiction' came in 2018 I think, but that's another story

Back to the original stock of parts. You don't need to check that the fake IC you buy, as marweg1967 noted earlier, has as many legs as the original

>>21913352
I recently dug into the resources from those years - I still have one L200 stabiliser and some ICL for a meter.
A lot of different parts, but there will be material for experimentation. I'll probably improve the old power supply on the LM350 with voltage regulation - for now it has a fixed 13.8 volts set to power low power mobile radio type devices.

@marweg1967 and others concerned....
TDA7313 has arrived. I tested quickly with single commands from the Atmega88. Selector, tone and volume. Everything works.

Admittedly, there is a circuit of a different manufacture in the vendor's photo.
I received one of these:

efi222 wrote:

The TDA7313 has arrived. I tested quickly with single commands from the Atmega88. Selector, tone and volume. Everything works.

Cool that you managed to come across the original or a good clone. Thanks for the info.

Most importantly, the systems purchased work.

Although they are rather fake (at least they look that way to me).

The ST stamp seems a bit lopsided, too "short" horizontally.
Below is a photo of the TDA7318D, the original 'recumbent' from my drawer.

efi222 wrote:

I’ll order one and see how it sounds

Exactly – how does it sound? Because the fact that it works is one thing, but does the sound quality meet your standards? I don’t really believe in copies being better than the originals, which, as my colleague tytka pointed out, may not be outstanding, but are decent. How do you rate these clones?

marweg1967 wrote:

Exactly – how does it sound? Because it works is one thing, but does the sound quality meet your expectations?

I’ve got the circuit connected to the PCM5102 output on the internet radio, as that was its intended purpose. In my opinion, it sounds quite good and I’m happy with it. At maximum volume with no signal in the headphones, there’s a slight hum. But I have to listen very closely to hear it. Given the ridiculous price of this circuit (4 zł), it’s best to simply try it out for yourself to see if it meets your listening requirements.

I control it using an Atmega 88. The tone potentiometers are connected to the ADC inputs with software-added hysteresis, so that if the tone is accidentally set at the step boundary, it doesn’t jump up or down. I also tried using encoders, but I don’t really like having to turn them round and round when adjusting the settings.
I still need to check the input switching to see if there are any ‘clicks’.

To sum up – I’m happy

efi222 wrote:

I'm happy

Well, that’s great I wonder if that hissing noise in the headphones would also occur with the original chips. Well, but someone who’s had experience with the originals would have to weigh in on that.

marweg1967 wrote:

I wonder if that hissing noise in the headphones would also occur with the original chips.

This hum is so faint that I had to switch the circuit on and off to detect any difference. The fact is, I’m getting on a bit and my hearing isn’t what it used to be
Perhaps I’ll ask my grandchildren to have a listen

efi222 wrote:

I’m getting on a bit and my hearing isn’t what it used to be

And thanks to that, our gear sounds better and better

I once worked with a guy who must have thought he was Super Batman, because he insisted he could hear 5 GHz (he was talking about WiFi) and it was keeping him awake. Explaining the difference between the audible range and 5 GHz didn’t help. But replacing the coil in the router’s power supply (along with the entire power supply) – that did.