Found in American documentation from the 90's, this circuit applies to other operational amplifiers. The frequency can be changed by changing the components.
Found in a 90s Electronic Design, this suggestion to have a higher voltage in a fixed regulator...
Here we show an oscillator that uses an LC network. The upper limit depends on the power-supply...
In the figure we have the circuit of a simple voltmeter with a 50 uA instrument and a 2k coil. The...