The term negative feedback circuit is identified in base64 scheme by the sequence bmVnYXRpdmUgZmVlZGJhY2sgY2lyY3VpdA==, while the MD5 signature is equal to 14ebf790632dc737924d4a1e004802e0. The ASCII encoding of negative feedback circuit in hexadecimal notation is 6e6567617469766520666565646261636b2063697263756974.