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View this project onCADLAB.io.

• checkout this project into yoursketchbook/libraries folder
• requires an amplifier on the PWM output pin (see below)
• seeblog articles

• ATmega328-based Arduinos (e.g., Uno, Pro, Pro Mini, etc.): pins 3, 9, 10
• ArduTouch: pin 9
• ATmega1280-based Arduinos (e.g., Mega): pins 44, 45, 46
• Arduino Leonardo: pin 5
• Arduino Due: pins DAC0 or DAC1
• Teensy 3.2: pin A14
• Teensy 3.5, 3.6: pins A21, A22
• Teensy LC: pin A12
• ESP8266: pins 0 to 16 (with analogWrite())
• ESP32: DAC1 or DAC2 (pins 25 or 26)

Component choices in this circuit aren't very critical:

• 22k (vs 27k) and 47n (vs 10n) parts in the input low-pass filter
• 100n (vs 10u) bypass capacitor between pin 7 and gnd
• Used the inverting input instead of the non-inverting one (although inthis circuit I noticed no difference)
• 47n (vs 100n) output snubber capacitor

• original implementation by Clive Webster inWebbotlib
• ported to Arduino byGabriel Petrut
• Stephen Crane modified it to use pins other than pin 10 with the help ofthis tutorial
• manitou48 added support for Leonardoand ARM processors with DAC (Teensy, Due)

• Teensyforum
• separate port/hack for MBED ARM with DACrepository
• Hackaday article onLM386 amplifiers