The time of this timer depends on C1. The circuit was found in the July 1994 Electronics Now magazine. The supply voltage depends on the relay and can go up to 12 V.
A high-frequency square wave oscillator using an LC-tuned circuit is shown here. The upper...
This circuit is suggested by the Texas Instruments Linear Circuits Applications, based on the FET...
Found in Maxim's documentation, this high frequency circuit uses period components. The graph...