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BackPin, https://www.winsen-sensor.com/d/files/semiconductor/mq-6.pdf Sensair S8 Series CO2 sensor, 1kHz PWM output.
- Other was worse. Images/IMG_6753.JPG Normal file.
- Or extend MK's 5-note to 8-note.
- 7.62mm 5W length 20mm width 6.4mm Capacitor C.