The Neutrodyne radio receiver, invented in 1922 by Louis Hazeltine, was a particular type of tuned radio frequency (TRF) receiver, in which the instability-causing inter-electrode capacitance of the triode RF tubes is cancelled out or "neutralized" to prevent parasitic oscillations which caused "squealing" or "howling" noises in the speakers of early radio sets. In most designs, a small extra winding on each of the RF amplifiers' tuned anode coils was used to generate a small antiphase signal, which could be adjusted by special variable trim capacitors to cancel out the stray signal coupled to the grid via plate-to-grid capacitance. The Neutrodyne circuit was popular in radio receivers until the 1930s, when it was superseded by the superheterodyne receiver.
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| - Neutrodyne (en)
- Нейтродин (ru)
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| - The Neutrodyne radio receiver, invented in 1922 by Louis Hazeltine, was a particular type of tuned radio frequency (TRF) receiver, in which the instability-causing inter-electrode capacitance of the triode RF tubes is cancelled out or "neutralized" to prevent parasitic oscillations which caused "squealing" or "howling" noises in the speakers of early radio sets. In most designs, a small extra winding on each of the RF amplifiers' tuned anode coils was used to generate a small antiphase signal, which could be adjusted by special variable trim capacitors to cancel out the stray signal coupled to the grid via plate-to-grid capacitance. The Neutrodyne circuit was popular in radio receivers until the 1930s, when it was superseded by the superheterodyne receiver. (en)
- Нейтродин — радиоприёмник прямого усиления на триодах с несколькими каскадами усиления высокой частоты, в котором использовались цепи нейтрализации ёмкости «анод-сетка». (ru)
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| - Modified Neutrodyne circuit in which the feedback is taken from the secondary of T2 instead of the primary. (en)
- Original Neutrodyne circuit. CN applies a second feedback signal to the grid which is 180° out of phase with the first, canceling it, to prevent oscillations. The signal is taken from an opposite phase winding on the interstage coupling transformer T2. (en)
- Tuned RF amplifier stage used in TRF receivers. Cgp, the internal capacitance between grid and plate in the tube , creates a positive feedback path from output to input which can cause the stage to oscillate, producing noises in the loudspeaker. (en)
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| - First Neutrodyne radio receiver closeup.jpg (en)
- First neutrodyne radio receiver.jpg (en)
- Neutrodyne circuit - modified.png (en)
- Neutrodyne circuit.png (en)
- Tuned RF amplifier stage.png (en)
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| - The Neutrodyne radio receiver, invented in 1922 by Louis Hazeltine, was a particular type of tuned radio frequency (TRF) receiver, in which the instability-causing inter-electrode capacitance of the triode RF tubes is cancelled out or "neutralized" to prevent parasitic oscillations which caused "squealing" or "howling" noises in the speakers of early radio sets. In most designs, a small extra winding on each of the RF amplifiers' tuned anode coils was used to generate a small antiphase signal, which could be adjusted by special variable trim capacitors to cancel out the stray signal coupled to the grid via plate-to-grid capacitance. The Neutrodyne circuit was popular in radio receivers until the 1930s, when it was superseded by the superheterodyne receiver. (en)
- Нейтродин — радиоприёмник прямого усиления на триодах с несколькими каскадами усиления высокой частоты, в котором использовались цепи нейтрализации ёмкости «анод-сетка». (ru)
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