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Diagnostic pin You said: Sign up using Email and Password. Components R1 series resistance and C5 capacitor between pin 7 and ground on the original TDA schematic are both required for correct behaviour.
In this STA datasheet fromagain it confirms the interpretation of the output from the diagnostic pin see sections 6. So the question is: Alejandro – Thanks for that clear update. Both speaker terminals on both speakers, must be connected only to their respective pins on the IC.
Yes, I double checked it.
In any case, both TDA projects which I found do use that resistor. I found datasheets for two other similar audio amplifier ICs, tda739 give more confidence in the interpretation of the diagnostic pin voltage mentioned above: Sign up using Facebook. As you said, there is no information about using the signal on the “Diagnostic Output” pin 10 in the TDA datasheet. I found datasheets for two other similar audio amplifier ICs, which give more confidence in the tds7379 of the diagnostic pin voltage mentioned above:.
The similar list ta7379 features might suggest that the implementation of the diagnostic output of the TDA may be tda737 to that in the TDAQ: This site in Chinese seems to be a simple circuit: After some searching, I found an older audio amplifier which I hope has a similar diagnostic output, to give us a clue about how to use the diagnostic output of your TDA although this reverse-engineering is not guaranteed to be correct.
Therefore I believe that temporary connection to gather diagnostic information should be safe.
This site in Portugese is more complex. I also have a regulator so I can get 5V but I’m not using it for this circuit. When you said “[ What can that diagnostic output tell us, and how does it do so?
Make sure not to connect any speaker terminal to “ground”. You can also use your oscilloscope to carefully measure the voltages on the other TDA pins, while the IC is powered and an audio signal is connected, to confirm that the signal tdz7379 definitely reaching the IC and that the voltages on the other pins seem reasonable for their function. You might want to review their use of the IC, to see if you learn anything from them which is different from your usage of the IC:.
This would be my approach, but since I don’t have that IC, Tdx7379 cannot guarantee the results. Below is an extract from the above STA datasheet which also confirms my earlier recommendation that ST-BY pin 7 must not be directly connected to the hda7379 voltage. I have explained my suggested approach below.
Of course you have to decide for yourself whether to take the risk, given that neither of us can find better information about the TDA! The current drain will tda77379 minimal on this rail, so no heatsink should be required.
I tried with two different chips, and after connecting STBY to VCC it starts to consume the correct quiescent current but there is no sound. There wasn’t much information in that document also it says it’s a preliminary version and I couldn’t find a newer oneand I couldn’t make it work.
The input voltage is 20V, input signal is about 0. Based on this diagram from the TDA datasheet: I hope this additional information is tda3779. However, an earlier audio amplifier, part number TDAQ datasheet viewable via this webpage had a similar-sounding feature.
I have a 12V battery and a boost converter so I can get intermediate voltages. Home Questions Tags Users Unanswered. For comparison, I found 2 website projects which use this IC. I have an oscilloscope available, do you recommend any tests?
The similar list of features might suggest that the implementation of the diagnostic output of the TDA may be similar to that in the TDAQ:. Do include R1 and C5. Circuit design When you said “[ Is it required that you use 20V supply to the IC, as you mentioned, or can you use a lower voltage tdx7379 12 to 15V?