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Chip Amps Amplifiers based on integrated circuits

softstart on bpa?
softstart on bpa?
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Old 17th July 2007, 02:58 AM   #1
Arx is offline Arx  Canada
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Default softstart on bpa?

what would be the effect of putting a softstart on each chip on a bpa circuit (using the mute pin)? It does input muting, correct? If so, I guess the outputs would fight until all the amps came up.

would sharing a capacitor make them close enough, or is it best just to leave them out?

-Nick
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Old 17th July 2007, 03:13 AM   #2
Leolabs is offline Leolabs  Malaysia
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Sharing the same muting circuit would be nice.
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Old 17th July 2007, 03:04 PM   #3
AndrewT is offline AndrewT  Scotland
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Hi,
soft start is the term usually applied to reducing the start-up current in a mains transformer.

Do you mean applying a delay to the mute/unmute pin?
So that the amp and surrounding circuits have time to stabilise before sending a signal to the speakers?

I would couple a resistor to each mute pin and then connect the other end of all the resistors together. Applying voltage or ground to the resistor junction will mute/unmute all the chipamps simultaneously.
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Old 17th July 2007, 04:40 PM   #4
Arx is offline Arx  Canada
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Quote:
Originally posted by AndrewT
Hi,
soft start is the term usually applied to reducing the start-up current in a mains transformer.

Do you mean applying a delay to the mute/unmute pin?
So that the amp and surrounding circuits have time to stabilise before sending a signal to the speakers?

I would couple a resistor to each mute pin and then connect the other end of all the resistors together. Applying voltage or ground to the resistor junction will mute/unmute all the chipamps simultaneously.
Well, it's a little more than just a delay, since as I understand it, it will unmute gradually as a capacitor voltage climbs and the current starts to flow out of the mute pin.

I'll probably just tie them all to V- with a resistor, since that seems like the safest option.

-Nick
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