Sorry for asking a non-keil related question. I have a microcontroller that generates some noise by a PWM signal / speaker. I use three NPN transistors as audio boosters. My power source is momentarily a power supply of 9V 750mA (will be batteries on the end). Can you recommend a way to boost the volume and to generate very high frequency sounds? Is there an advantage to use an audio amplifier rather than NPN transistors if I don't care about sound quality?
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