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 is from old documentation, but the regulator may be 78xx series equivalent and the...
This interesting automotive alarm was found in an English publication from the 1980s. The circuit...
This circuit makes use of a PLL 567 and the components must be calculated according to the desired...