Based on an LM36000 OTA this circuit was found in the July 1988 issue of Radio Electronics magazine. It covers frequencies in the range of 45 Hz to 45 kHz.
With the capacitor used, this circuit provides delays of 40 to 60 seconds. Larger capacitors can...
Found in an Electronic Design from the 90's, this circuit generates signals for stepper motor...
The circuit shown in the figure can generate signals up to 1.6 GHz. Coil L1 and capacitor C2 are...