Filtered PWM Signal
This triangle wave is the residual PWM signal (originally a square wave) after filtering through a simple RC network. The resistor is 1kΩ and the capacitor is 68nF. Amplitude of the 31.25kHz signal is about 0.6V. This seems a bit much to me, so I propose to try a more sophisticated active filter circuit. The scope is a rather beaten-up Philips PM3335.
UPDATE: This is the type of filter that I'm thinking of:
interface.khm.de/index.php/lab/experiments/arduino-dds-si...
Filtered PWM Signal
This triangle wave is the residual PWM signal (originally a square wave) after filtering through a simple RC network. The resistor is 1kΩ and the capacitor is 68nF. Amplitude of the 31.25kHz signal is about 0.6V. This seems a bit much to me, so I propose to try a more sophisticated active filter circuit. The scope is a rather beaten-up Philips PM3335.
UPDATE: This is the type of filter that I'm thinking of:
interface.khm.de/index.php/lab/experiments/arduino-dds-si...