Next to test was 2 classic budget ICs: TDA1543A and TDA1545A. Unfortunately, despite the time spent i failed to make them work properly. I suspect that they could be fakes, since i got them from chinese platform for a price of € 1,6 per 5 pieces, giving € 0,30 a piece. I have no plans to buy them from trusted supplier, since then price leaven no senso of using them in low-budget projects.
Data format: left justified, stereo output
Ouput: high-impedance, biased, requires output driver
Price: ~€0.30 per unit
So lets call them replicas of TDA154X and see how output looks like. I've connected both according to original's datasheet, input still the same: mono wav file generated by esp8266 module using ESP8266Audio library modified for LJ format, industry standard 44.1Khz sampling rate.
TDA1545A, no output filters, 2KHz
![](https://cdn.hackaday.io/images/2544691594843942786.jpg)
TDA1545A, no output filters, 10KHz
![](https://cdn.hackaday.io/images/6261451594843943415.jpg)
Input signal is visible, so i guess data format is OK. However waveform is so messed up, i can't be bothered to connect it to amp and speakers.
TDA1543A, no output filters, any signal
![](https://cdn.hackaday.io/images/8379271594844049442.jpg)
I failed to make it work really, it looks like input format is wrong, even it is ok for TDA1545, and they suppose to have same input format. So nothing I really could say about that.
I tried few different ICs, from same seller however, so makes not much sense to expect a difference.
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