Keywords: Allpass DIN.svg A schematic of an w all-pass filter implemented with an w operational amplifier Allpass svg 2008-09-12 11 31 UTC derivative work Cepheiden <span class signature-talk >talk</span> Allpass svg Foobaz DIN symbols Cepheiden Allpass svg </nowiki> Uploaded with derivativeFX Allpass filter circuits Active filter circuits |