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AVR PWM Pulse Width Modulation - Tutorial #12
https://www.electroschematics.com/avr-pwm/#:~:text=For%20making%20PWM%2C%20AVR%20contains%20separate%20hardware%21%20By,%2816bit%29%20and%201%20is%20located%20on%20timer%2Fcounter2%20%288bit%29.
PWM Audio Generation With An AVR | Hackaday
https://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/
[Dane] sent in his sweet AVR hack. He used the PWM output to play pre-recorded audio output. It’s not very high quality, but it could be useful for …
AVR131: Using the AVR’s High-speed PWM
https://ww1.microchip.com/downloads/en/AppNotes/Atmel-2542-Using-the-AVR-High-speed-PWM_ApplicationNote_AVR131.pdf
In the AVR®, the timer/counters can be used to generate PWM signals. PWM base frequency is determined by timer clock frequency and top counter value. Faster clock frequency will increase the PWM base frequency and vice versa. Lower top value will reduce the time for overflow, which thereby increases the PWM frequency.
AVR PWM Pulse Width Modulation - Tutorial #12
https://www.electroschematics.com/avr-pwm/
PWM & AVR For making PWM, AVR contains separate hardware! By using this, the CPU instructs the hardware to produce PWM of a particular duty cycle. The ATmega8 has 3 PWM outputs, 2 are located on timer/counter1 (16bit) and 1 is located on timer/counter2 (8bit). Timer/Counter2 is the simplest PWM device on the ATmega8.
Atmega16 - audio on PWM output | AVR Freaks
https://www.avrfreaks.net/forum/atmega16-audio-pwm-output
I'm trying to read a .wav file from SD card, use data to control PWM output and send it to a simple speaker (8 Ohm, 0.5W connected directly to output via 150 Ohm resistor). Reading from card works OK (tested). My test wav file is a 3 second sine wave (3 different frequencies, 1 second each) recorded as 8000 Hz sample rate, 8 bits per sample.
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