With two cascading tunnel diodes, this circuit found in a 196 General Electric documentation provides capacitor-dependent delays.
Found in an EDN from the 90's, this circuit can be implemented with modern operational amplifiers....
The two power steps below are intended for use with the SAA1027 stepper motor control but can be...
Indicated for discriminators adjustment in FM and VHF receivers, this circuit was found in a 90s...