This circuit is from the Texas Instruments operating amplifier manual. Any operational can be used and the font need not be symmetrical. Rf and Rg determine the gain of the circuit.
July 2016 - It can be obtained from Mouser Electronics new trinkets Adafruit. These trinkets are...
Based on an LM36000 OTA this circuit was found in the July 1988 issue of Radio Electronics...
Found in a 90's EDN, this circuit generates signals in the frequency range given by the graph. The...