Hello everybody,
I am currently using the Arduino (MKR Zero) to realize a mono audio output with a speaker. It should become a special player for my daughter.
It is important to know that I have almost no experience in electrical engineering, but a lot of fun !!!
Currently I read WAV files (44.1khz, 16 bit, mono / stereo) and output them on the DAC with 10 bit (0 - 3.3V). Works so far with an in-ear headphone. I do not use the AudioZero library because it uses the DAC with 10 bit, but only supports WAV files with 8 bit samples (uint8_t * __ WavSamples;) and does not allow any tasks besides playing.
For further testing, I would like to operate a small 8 ohm speaker with 1 W. Therefore, the plan is to use an audio amplifier IC.
I have already bought two different ICs weeks ago (UA741 CN, NE5534 AP). Since I've read that the UA741 is bad and the gain / balancing with the NE5534 does not work really well/easy, my electronics dealer around the corner recommended the TDA2050 to me. This would be sold most often and offers very good performance. I bought a couple of the ICs.
Here is a datasheet:
www.st.com...../en.CD00000131.pdf
My problem is that I can not interpret the information from the Internet well enough and also can not interpret the found schemas well (Sorry, I'm a software developer). Unfortunately I understand only representations like this here with the LM386:
By the way, the LM386 seems to cause distortion and the IC was not available any more.
According to the information found so far, for the TDA2050 i need a power source with + 5V and -5V or, for example, + 12V and -12V!
As a power supply, I would like to use a 5V or 12V source. If necessary, a battery. However, the power supplies I know have only + and GND but no negative V!
Hence my question:
- How do I get a negative voltage from my power supply (+ 5V or + 12V and GND)?
- Is someone familiar with a simple representation of a TDA2050 schematic (such as the PNG above)? Or would it be possible for someone to do such a thing?
- According to the linked PDF on page 2, Figure 2. Pin connections should the IC package connect to pin 3 (negative voltage V-)? Can that be right?
I hope someone here, who knows the electronics better and is helpful. I would not report here otherwise.
Thank you, DrDooom.