Foster–Seeley discriminator The Foster–Seeley discriminator[1][2] is a common type of FM detector circuit, invented in by Dudley E. Foster[3] and Stuart. FOSTER-SEELEY DISCRIMINATOR The FOSTER-SEELEY DISCRIMINATOR is also known as the PHASE-SHIFT DISCRIMINATOR. It uses a double-tuned rf. Foster Seeley Discriminator – Download as PDF File .pdf), Text File .txt) or read online. foster.

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C5 charges to the sum of the voltages across R1 and R2 and, because of its time constant, tends to filter out any noise impulses.

Power management RF technology Test Wireless. Therefore a limiter amplifier stage must be used before the detector, to remove amplitude variations in the signal which would be detected as noise.

Offers good level of performance and reasonable linearity. The Foster Seeley discriminator circuit is characterised by the transformer, choke and diodes used within the circuit that forms the basis of its operation. Discriminatoe obtain the different phased signals a connection is made to the primary side of the transformer using a capacitor, and this is taken to the center tap of the transformer.

Foster Seeley Discriminator or FM Detector

Christopher James Christie born September 6, is an American politician, former federal prosecutor, and political commentator who served as the 55th Governor of New Jersey from to Does not easily lend itself to being incorporated within an integrated circuit.


The radio has both AM and FM receivers. No phase shift occurs at resonance and both voltages are equal. This tank circuit L3 and C3 is tuned to the center frequency of the received discriimnator signal so that it will oscillate at that frequency. The times when both grids are positive are shown by fosster shaded area of view E. Member feedback about Detector radio: From Wikipedia, the free encyclopedia.

Foster–Seeley discriminator | Revolvy

C3 charges until it becomes sufficiently negative to cut off the current flow. Since the winding is inductive, the voltage drop across it is 90 degrees out of phase with the current through it.

A transformer, tuned to the carrier frequency, is connected to two rectifier diodes. Views Seeleey Edit View history.

In the first years of his career in the navy, he was successively posted to various school ships and warships, finally to the cruiser “Coetlogon”.

C2 and L2 form the secondary tank circuit. In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage.

March”Automatic tuning, simplified circuits, and design practice”, Proceedings of the Institute of Radio Engineers25 3: Both diodes conduct equally. The quadrature grid acts much the same as the limiter grid; it either opens or closes the passage for electrons.

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This gives a signal that is 90 degrees out of phase. The limiter acts as a class-A amplifier at lower amplitudes; at higher amplitudes it becomes a saturated amplifier which clips off the peaks and limits the amplitude.

Foster Seeley Discriminator | FM Radio Detector Demodulator | Tutorial

These amplitude variations are then rectified to provide a dc output voltage which varies in amplitude and polarity with the input signal frequency.

Byhe had campaigned for Presidents George H. Simple to construct using discrete components.

The Foster Seeley circuit was widely used until the s when ICs using other techniques that were more roster integrated became widely available. Foster[3] and Stuart William Seeley.

Foster Seeley Discriminator: FM detector / demodulator

Bush and George W. Because the winding is inductive, the voltage across it is 90 degrees out of phase with the current through it.

The resonant frequency of the tank is the frequency at point 4. Member feedback about Libertarianism: Unlike modern radio stations which transmit sound an audio signal on an uninterrupted carrier wave, early radio stations transmitted information by radiotelegraphy.

Their algebraic sum is 0 volts and the output voltage is 0 at resonance.

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