TDA 7294 mute and standby are voltage driven, not current. >3.5V on the relevant pin will turn the amplifier into active state.
The ST datasheet also has a recommendation for specific turn-on of the two pins (stby turn on before mute, switch off after). It is not recommended to stray for those recommendations.
The ST datasheet also has a recommendation for specific turn-on of the two pins (stby turn on before mute, switch off after). It is not recommended to stray for those recommendations.
It depends on the capacitor value.
At 33V, a 10uF capacitor will have a pretty long hold-up time and will continue to feed the pin.
You can sort this out by adding a 2K resistor across the mute cap. This will act as a voltage divider in conjunction with the 10k Rmute. A 5.1V zener or three LEDs in series will also perform a similar function.
At 33V, a 10uF capacitor will have a pretty long hold-up time and will continue to feed the pin.
You can sort this out by adding a 2K resistor across the mute cap. This will act as a voltage divider in conjunction with the 10k Rmute. A 5.1V zener or three LEDs in series will also perform a similar function.
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