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Author Topic: Question about choke on power amp  (Read 919 times)

Agung Kurniawan

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Question about choke on power amp
« on: January 27, 2017, 06:34:33 PM »
In SS power amp, is that any bad affect if I ignore the choke that come before the speaker?


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Re: Question about choke on power amp
« Reply #1 on: February 07, 2017, 10:07:29 PM »
Speaking in general terms, that inductor isolates any capacitive load from the amp. If the power amp has high open loop gain or marginal stability, (like most chip amps) a capacitive load might cause the amp to oscillate at an ultrasonic frequency. This usually causes the amp to self destruct in short order. Most amps have a Zobel across the output, a series RC network of something like 0.1uF and 10 Ohms. An ultrasonic oscillation usually causes the 10 Ohm resistor to go up in smoke just before the fuse blows

You might get lucky without the inductor, or you might end up with a smoldering mess.