RF or even switching transistors like the 2N2222 can be used in this circuit. The capacitors are ceramic and the frequency is determined by the crystal.
This circuit was found in a 1977 Radio Shack documentation. Its purpose is to generate 1 Hz...
The gated oscillator in the figure bellow tums on when a “0" Iogic Ievel is applied to its input....
The circuit shown here uses a 4047 to produce three signals whose frequencies are determined by C...