Hello, I need to limit the input signal voltage in my TPA313 amplifier within the range of 0V to 5V, and since the input has an offset of 2.5V, a 4.7V zener is perfect for cutting off signal peaks almost symmetrically beyond ~5V and ~-0.7V. In practice, it works, but the TPA seems to enter some kind of loop every 2 seconds: with no signal applied, it works correctly for 1s, the next second there is a snap, where the speaker membrane remains tense and still at its maximum height without any sound, including noise.
Where am I going wrong? Or alternatively to a zener, what could I use for the same purpose?
The zener is placed with the cathode to RIN+ and anode to GND. There is a 100R resistor between the input cap and the preamplifier.
Grazie.
Where am I going wrong? Or alternatively to a zener, what could I use for the same purpose?
The zener is placed with the cathode to RIN+ and anode to GND. There is a 100R resistor between the input cap and the preamplifier.
Grazie.
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