AudioLogs

23/02/2025

Protect your products with the certificate, eFuse TPS259631DDA

Similar e-fuse to TCKE812, except this time we set the current between 0.125 and 2A. With this eFuse in our product, we are certified IEC 62368-1:2023 on safety current protection of the product.

12/02/2025

eFuse or reset fuse with TCKE812

When a circuit needs current and voltage protection, we can use an electronic fuse with TCKE8xx circuits. With the resistor value, we set the limit current when the fuse turns off. With the capacitor value, how quickly the IC reacts and turns off the output. The output resistance is only 28 mΩ. If we choose modules 805 for 5 volts (6V blocking) and 812 for 12V (15V blocking), the IC also protects the circuit from excessive voltage. The IC operates from 4.5V to 18V. It only needs 0.3V to operate, and the quiescent current is 0.5mA, which is excellent.

03/02/2025

VirtualSoundModule 1.0 prototype

-custom sounds module (custom sounds)
-RTOS audio core (circular buffer/FIFO, 1ms latency)
-ARMV7 A-cortex single core 1GHz (zero 1.1)
-512 MB RAM
-256 sounds poplyphonic (A53 cortex Zero 2, quad core, 1024 sounds polyphonic)
-4096 sound supports in RAM (for example 60 organ registers) 16bit, 44.1kHz
-multilayers sounds support (piano or accordion define sample layer sound according to the volume level)
-MIDI IN
-MIDI wifi
-system exclusive MIDI for Effects and sounds (virtual pipes or reeds on/off)
-audio output (I2S bus board, high-end audio)
-OS & sounds on SD card
-support raw, wav or sf2 sounds with loop markers

The module is intended for your own recorded or virtual specific musical instruments that you want to play.e But we can also use a standard MIDI module with sounds. The program works so that when turned on, it scans the SD card and loads the sounds into RAM. We can load 4096 sounds. If we used a 4-core ARM A53 cortex processor, we could play up to 1024 polyphonic sounds.
With sysex MIDI we define what we want and how we want to play the sounds.
The same as turning on the pipes on the organ and the reeds on the accordion. It can be played with or without a loop, depending on the sound that we will use, e.g. piano. The DSP effect can be set to a single sound or a final effect, reverb, delay, tremolo..etc. It also contains a software limiter final part, because a distorted sound occurs with a large amount of sounds. The sound card is separate, due to noise and possible digital hum.
RTOS means that several subprograms can run simultaneously. So for managing MIDI commands, for loading sounds and reading sounds from RAM and the main program, or sound generator, which makes a word from digital samples, converts it into analog form and we hear the sound. This happens very quickly, we have a 1Ghz clock, we hear it as a set of sounds that we have triggered with MIDI commands. The art is to make a routine so that during the transitions you can hear clicking and popping in the sounds, because it can happen that a bit is also lost.
Via the I2S bus, the digital form of sounds is converted into analog, that is on the sound card (RCA output).

15/01/2025

Replaced MP1584EN with LM2596S 3A dc-dc step-down converter. Although they state that MP1584EN is suitable for battery power, unfortunately it is not, in idle mode, it consumes too much current, up to 30mA of quiescent current, even if we reduce its buck frequency. While it is a great alternative to LM2596, its quiescent current is only 4.7mA.
After measurements, it turned out that the quiescent current at an input voltage of 13.5V (we simulate a 12V battery) is only 4.3mA, which is great. Better than expected. The datasheet mentions a current of 4.7mA. The output voltage is very accurate, exactly 5.00V.
Why do I minimize the quiescent current, because I have the device in deepsleep mode most of the time, then the quiescent current must be minimal.

14/11/2024

To the limits and beyond. An optocoupler is a galvanic isolation. This time we can also use it, as a driver. Darlington LTV-352T, with flyback diode, has 150mA final current, this time it held 158mA current and died 🤣. Primary (LED) is 1.1V and 7mA. It is stable at 100mA, without overheating. It can be used directly, for the relay driver, without the use of an intermediate transistor.

30/08/2024

Lyrics for musicians:

Connect to chrome desktop remote, where you can share your screen or use the remote function of another screen. It is possible to control several screens at the same time.
-download the Chrome Remote Desktop function (win, android or OS)
-share a screen so that one controls the screens and synchronizes, phone, tablet, or smart android TV (for stage)
-download kiosk chrome if you want to have the lyrics not on the big monitor, on the stage
-you all have to sign in with one email name and you have to be on a common wi-fi network, one device is an access point
- upload lyrics to the url page, it can be local or a remote server, in the latter case you must have internet access
-if you have a remote server, you can correct, renew or add lyrics (advantage because everyone has the same)
-you don't need an app and a license, free to use

03/07/2024

Something new is being created.

04/06/2024

AL logo still works.

18/05/2024

Ultimate version 2.1 ;)

Diatonična "Playback" harmonika BLE-HTML set z aplikacijo"Playback" Easy set za Diatonično harmoniko z aplikacijo:Stereo zvok in kvalitetni avdio studijski p...

22/04/2024

Prototype lyrics app for diatonic accordion playback. Every time a song is set, the text of the song is shown to us, we can sing along, or the gathered company of listeners can sing along with us.

03/04/2024

Darko, where are you? Your laptop is running great. It has been working on great projects for five years.

18/12/2023

https://www.audiologs.com/ozrenbilan/esitemap.htm

password some of pdf files: zvuk