By using an RC network to add slow negative feedback to the inverting Schmitt trigger, a relaxation oscillator is formed. The feedback through the RC network causes the Schmitt trigger output to oscillate in an endless symmetric square wave (i.e., the Schmitt trigger in this configuration is an astable multivibrator).

इंदडक्टैंस गाइरेटर (Inductance gyrator)
इंस्ट्रुमेंटेशन एम्प्लिफायर (Instrumentation amplifier)
रिलैक्शेशन एम्प्लिफायर (Relaxation oscillator)
वोल्टेज अनुगामी (Voltage follower)