In this tutorial, we are demonstrating a project of a Portable AM Receiver by using an IC ZN414 or MK484. Designed around the ZN414 IC, this receiver covers the medium wave band from roughly 550 to 1600KHz. The curl and tuning capacitor might be taken from an old MW radio to save time. The ZN414 IC has now been supplanted by the MK484.
The coordinated circuit is a 3-pin, tuned radio frequency circuit, and fuses a few RF stages, automatic gain control, and an AM detector. It is handily overloaded and the working voltage of the IC is to some degree basic to accomplish great outcomes.
Hardware Components
The following components are required to make AM Receiver Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1 | IC | MK484 | 1 |
| 2 | Transistor | BC109C, BC108B | 2, 1 |
| 3 | Battery | 9V | 1 |
| 4 | Diode | 1N4148 | 6 |
| 5 | IC | 741 | 1 |
| 6 | Speaker | 8R | 1 |
| 7 | Resistor | 2.7K, 10K, 120K, 820R, 22K, 150K, 4.7R | 1, 3, 1, 1, 2, 1, 2 |
| 8 | Variable Resistor | 10k | 2 |
| 8 | Capacitor | 2.2µF,33µF, 2200µF, 220µF | 2, 1, 1, 1 |
MK484 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of MK484
AM Receiver Circuit
Working Explanation
In this circuit a little voltage regulator is worked around the BC108B transistor, four 1N4148 diodes, the 2k7 and 10k resistor, and the 820R resistor. The 10k pot goes about as a selectivity control for the entire receiver, controlling the working voltage for the ZN414 (or MK484). If you live in a zone that is pervaded with strong radio signals, at that point the voltage should be diminished. I discovered the ideal execution with a supply of around 1.2 volts.
The sound amplifier is worked on an inverting 741 operational amplifier circuit. Additional present lift is given utilizing the BC109C/BC179 complementary transistor pair to drive an 8ohm amplifier. The voltage addition of the total sound amplifier is around 15V. The sound yield of the total recipient is very acceptable and liberated from distortion.
Applications and Uses
AM Receiver is used for long-distance international broadcasting. This circuit is a Wireless (WiFi) modem, Bluetooth modem, and Microwave relay.
