This circuit was obtained from a 1980's QST magazine. The circuit can generate 1 to 15 MHz signals with 1 Vpp at 50 ohms load. Used transistors are still common today.
This configuration is suggested by Mullard (Philips) in an old manual of 555 integrated circuits....
This circuit can operate with 5 uV to 1 mV input signals from low impedance sources such as...
This circuit uses a metal enclosed transistor as a temperature sensor. The circuit is from an old...