This circuit was obtained from an American 1980s documentation. The frequency depends on the crystal and the circuit may be a PNP that reaches the generated frequency.
Using a new Maxim integrated circuit (www.maxim-ic.com) the amplifier shown in the figure can be...
This 80's Motorola circuit can generate 100 MHz signals, but they can reach 200 MHz with the...
This simple circuit to monitor the frequency of the power grid uses an analog indicator. The...