Leithäuser circuit
The Leithauser oscillator generates a sinusoidal signal and is a variant of the Meißner circuit . An autotransformer without galvanic separation between primary and secondary winding is used.
Gustav Engelbert Leithäuser published this circuit in 1926. The Leithauser circuit is used for single-circuit radio receivers. The resonant circuit and feedback inductance can be built as a loop antenna .
functionality
The resonant circuit in the Leithauser circuit consists of C1 and winding 1 of the autotransformer TR1. The feedback takes place via C2 and winding 2 of the autotransformer. The amplifier Q1 rotates the phase between input and output by 180 °. The connection of the windings of TR1 also results in a phase rotation of 180 °. Together, this results in the phase rotation of 360 ° required for an oscillation. The gain is determined by R1, the ratio of the transformer turns and C2. A gain of at least 1 is required to maintain the oscillation. For a clean output signal without harmonics, the gain should only be so large that the oscillator starts to oscillate safely. The high-frequency choke L3 prevents the high-frequency voltage from being short-circuited across the battery. With C3 the output signal of the oscillator is decoupled.
literature
- ↑ Austrian Radio Amateur, episode 5/1927, page 340, link ( page can no longer be accessed , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
