The circuit shown is from Motorola's 1990 Linear Databook. Shaded components are optional. The characteristics of the coils are given next to the diagram.
Current drain with a 6 V supply is only 6 µA. Frequency is given by the capacitors, and output...
This circuit is from a Hands-On Electronics from the 90s. The integrated amplifiers used are well...
This configuration enables the use of low current switches or sensors to control high power loads...