This circuit is from American documentation from the 70s. This configuration appears in this section obtained from other sources. The signal is sinusoidal determined in amplitude by D1 and D2.
This circuit is from a Linear Technology integrated circuit manual from the 1990s. The circuit...
This basic configuration of voltage regulator using operational amplifier and zener was found in a...
This Colpitts crystal oscillator was found in an American publication for amateurs in the 1980s....