Radio receiver circuit for long and medium wave
#radio receiver
#long wave
#medium wave
#ferrite bar
#oscillating circuit
#variable capacitor
#coil winding
#CuEm wire
#RF circuit
#tuned circuit
Description: Oscillating circuits (coils) are constructed on a ferrite bar. For long wave reception, winding "1-2" consists of 135 turns, while winding "3-4" consists of 20 turns. For medium wave reception, winding "1-2" has 75 turns, and winding "3-4" has 7 turns. The wire used must be copper enamel (CuEm) with a diameter of 0.15 mm. A variable capacitor with a range of 40-400 pF must be connected in parallel with winding "1-2". The listening signal is generated using high-impedance headphones rated between 1000-2000 ohms, which have a 10 nF capacitor connected in parallel.
The described oscillating circuit utilizes a ferrite bar as its core, which enhances the inductive properties of the windings. The choice of ferrite material is critical, as it provides the necessary magnetic permeability to optimize the circuit's performance across the desired frequency ranges. The windings "1-2" and "3-4" are configured to create two distinct inductors, allowing the circuit to be tuned for long-wave or medium-wave reception.
For long-wave applications, the winding specifications of 135 turns for "1-2" and 20 turns for "3-4" ensure that the circuit can resonate at lower frequencies, which are typically below 300 kHz. Conversely, the medium-wave configuration, with 75 turns for "1-2" and 7 turns for "3-4", allows for resonance at frequencies typically ranging from 530 kHz to 1700 kHz. The use of CuEm wire with a diameter of 0.15 mm is appropriate for minimizing resistive losses while maintaining adequate flexibility for winding.
The integration of a variable capacitor (40-400 pF) in parallel with winding "1-2" is essential for tuning the circuit. This capacitor allows for fine adjustments to the resonant frequency, enabling the user to select specific stations by varying the capacitance. The presence of high-impedance headphones (1000-2000 ohms) ensures that the circuit can effectively drive the audio signal without loading down the oscillating circuit, which could lead to distortion or loss of signal quality. The additional 10 nF capacitor in parallel with the headphones serves to filter high-frequency noise, providing a clearer audio output.
Overall, this oscillating circuit design is well-suited for amateur radio enthusiasts and provides a practical means of receiving long and medium wave signals with clarity and precision. Proper construction techniques and component selection are crucial for achieving optimal performance and reliability in operation.Oscillating circuit (coil) are made on a ferrite bar. If you wish to listen long waves winding "1-2" has 135 turns and 3-4 has 20 turns. If you wish to receive medium wave winding "1-2" has 75 turns, and "3-4" has 7 turns (wire used must be CuEm 0. 15mm). In parallel with the winding 1-2 is necessary to connect a 40-400pF variable capacitor. Listen ing signal is made using high impedance headphones to 1000-2000 ohms, which have a capacitor of 10nF in parallel.
The described oscillating circuit utilizes a ferrite bar as its core, which enhances the inductive properties of the windings. The choice of ferrite material is critical, as it provides the necessary magnetic permeability to optimize the circuit's performance across the desired frequency ranges. The windings "1-2" and "3-4" are configured to create two distinct inductors, allowing the circuit to be tuned for long-wave or medium-wave reception.
For long-wave applications, the winding specifications of 135 turns for "1-2" and 20 turns for "3-4" ensure that the circuit can resonate at lower frequencies, which are typically below 300 kHz. Conversely, the medium-wave configuration, with 75 turns for "1-2" and 7 turns for "3-4", allows for resonance at frequencies typically ranging from 530 kHz to 1700 kHz. The use of CuEm wire with a diameter of 0.15 mm is appropriate for minimizing resistive losses while maintaining adequate flexibility for winding.
The integration of a variable capacitor (40-400 pF) in parallel with winding "1-2" is essential for tuning the circuit. This capacitor allows for fine adjustments to the resonant frequency, enabling the user to select specific stations by varying the capacitance. The presence of high-impedance headphones (1000-2000 ohms) ensures that the circuit can effectively drive the audio signal without loading down the oscillating circuit, which could lead to distortion or loss of signal quality. The additional 10 nF capacitor in parallel with the headphones serves to filter high-frequency noise, providing a clearer audio output.
Overall, this oscillating circuit design is well-suited for amateur radio enthusiasts and provides a practical means of receiving long and medium wave signals with clarity and precision. Proper construction techniques and component selection are crucial for achieving optimal performance and reliability in operation.Oscillating circuit (coil) are made on a ferrite bar. If you wish to listen long waves winding "1-2" has 135 turns and 3-4 has 20 turns. If you wish to receive medium wave winding "1-2" has 75 turns, and "3-4" has 7 turns (wire used must be CuEm 0. 15mm). In parallel with the winding 1-2 is necessary to connect a 40-400pF variable capacitor. Listen ing signal is made using high impedance headphones to 1000-2000 ohms, which have a capacitor of 10nF in parallel.
W3HWJ Radio Receiver Projects
The logical first choice was to start with simple regenerative circuits, utilizing one or two transistors and possibly a basic audio amplifier with a single integrated circuit. A few simple tube radios purchased at flea markets will delay any tube...
regenerative radio receivers
A regenerative radio receiver is known for its simplicity, weak signal reception, inherent noise-limiting and automatic gain control (AGC) action, as well as its immunity to overloading and spurious responses. The regenerative radio receiver, often referred to as "regen," operates...
radio receiver circuit long and medium wave
Oscillating circuits (coils) are constructed on a ferrite bar. For long wave reception, winding "1-2" consists of 135 turns, while winding "3-4" has 20 turns. For medium wave reception, winding "1-2" has 75 turns, and winding "3-4" has 7 turns....
45-860MHz Radio receiver based on UV916-tuner
To build a Spectrum analyzer I needed a tuner. I also needed to learn how to control the tuner. In some old broken TV I found the tuner UV916. It is a common used tuner. The tuner is PLL synthesized...
Medium Wave radio reciever circuit
This radio receiver can operate with any of the following transistors: ZN414, MK484, or TA7642.
The radio receiver circuit is designed to utilize a variety of transistors, specifically the ZN414, MK484, and TA7642, which are commonly used in low-power AM radio...
make this one transistor radio receiver
This is likely the simplest radio that can be assembled. The circuit design is straightforward enough to be completed in just a few minutes, allowing users to listen to their favorite programs immediately. The circuit of a single transistor radio,...
Variable capacitor and Crystal radio
This circuit allows the selection of a station by adjusting the capacitance in an LC circuit. However, the signal remains modulated. To demodulate the signal, a second capacitor is required, but the function of this component is unclear. The available...
tuned radio frequency receiver
Tuned radio frequency receiver. A radio receiver consisting of several amplifier stages that...
A tuned radio frequency (TRF) receiver is a type of radio receiver that utilizes multiple amplification stages to enhance the reception of radio frequency signals. The design typically...
active medium wave antenna
The circuit diagram is designed to enhance the input of a telescopic whip antenna. The preamplifier is intended to operate within the medium waveband, covering frequencies from approximately 550 kHz to 1650 kHz. A tuning voltage is provided through RV2,...