solid state audio filter for picomite PWM output, JLC basic

Author	Message
DaveC5 Newbie Joined: 24/09/2025 Location: United Kingdom Posts: 40	Posted: 06:41am 04 Nov 2025       Hi, hope you don't mind me jumping in, The other thing the diode and resistor arrangement on the op-amp input does is limit the PWM from the Pico to less than 1Vpkpk centred around Vsupply/2. You trade the full 3.3Vpkpk swing from the Pico for a smaller one, but it does mean you're not restricted to using rail-rail parts in the filter op-amp. You could perhaps then restore the full voltage swing by setting the PAM input amplifier gain accordingly.