Complete Radio Set with MK484 and Loudspeaker
The AM radio set utilizes the MK484 integrated circuit, which is specifically designed for AM radio reception. The circuit configuration includes a PNP transistor that amplifies the audio signal sufficient to drive a 150-ohm loudspeaker, making it suitable for personal listening applications. The MK484 operates within a voltage range of approximately 1.2 to 1.6 volts, which is achieved through a power supply configuration involving a 3V battery in series with two 1N4114 diodes. This arrangement helps to regulate the voltage supplied to the IC, ensuring stable operation.
The use of 1N4004 diodes as a substitute for the 1N4114 diodes provides flexibility in component selection while maintaining the necessary forward voltage drop to achieve the desired operating voltage for the MK484. The circuit also incorporates a 2k ohm volume control, allowing the user to adjust the audio output level to their preference.
The overall design is compact and efficient, leveraging minimal components to achieve a functional AM radio receiver. The simplicity of the circuit makes it an excellent choice for hobbyists and educational projects, illustrating fundamental principles of radio frequency reception and audio amplification. This AM radio set is a practical demonstration of integrating low-voltage components to create a working audio device.A complete AM radio set based on the MK484 IC (formerly ZN414). It uses a PNP transistor and can drive a 150R loudspeaker. Chad has built a complete radio receiver using 1 IC and a single transistor. The IC requires around 1.2 to 1.6V and this is supplied via the 3V battery in series with 2 diodes 1N4114 diodes, (1N4004 can be substituted) and the 2k volume control. 🔗 External reference
Related Circuits
For this radio, which I repaired for someone, I made this DIY VL1. Later I found the real tube. The circuit described involves a DIY VL1 radio project, which suggests a focus on vacuum tube technology. The VL1 likely refers...
This compact FM transmitter has a range of approximately 50 meters and is designed for hobbyists. With multiple mini-transmitters, users can create a diverse and engaging radio program. The device achieves high frequency stability due to its power supply...
The TDA7000 is an integrated circuit (IC) designed for FM portable radios, featuring a Frequency-Locked Loop (FLL) system with an intermediate frequency of 70 kHz. It incorporates several functions, including an RF input stage, mixer, local oscillator, IF demodulator,...
An FM radio integrated on a single chip that requires only a few basic peripheral components. Specifically, the chip needs only one simple coil, and its alignment is straightforward. The chip incorporates an RF input stage, mixer, local oscillator,...
An FM radio generates an interference signal that can be detected on another FM radio tuned 10.7 MHz higher than the original. A 50 kΩ potentiometer is used to adjust the modulation level to its maximum without introducing distortion....
Ham Radio (amateur radio) is a popular hobby amongst electronics enthusiasts all over the world. Basically the hobby involves a person in making his own gear consisting of a receiver and transmitter or a transceiver (a receiver and a...