Home Blog  





6 Dec 2013

Application:

A small, simple AM receiver project.  This AM receiver can pick up medium wave stations in your area

Description:

This circuit can use general purpose transistors, and in this example there are 3 BC109C transistors.  In this schematic and BOM there is a 200uH inductor and a trimmer 150-500pF capacitor, though these parts can be salvaged from an old AM radio, to preserve the directional nature of a tuning coil, and an adjustment knob (plate capacitor) that work well for radio reception.

The 120k resistor is for regenerative feedback between the Q2 NPN transistor and the input to the tank circuit.  The value of this resistor is important to the performance of the entire circuit.  In fact, it may be better to replace the fixed value with a variable resistor paired with a fixed resistor to adjust the oscillation and sensitivity of the circuit.  All the connections in this circuit should be short to minimize interference.

Performance of the circuit will vary depending on stray capacitance in your layout, the inductor winding/core/length, etc.  Changing values of some of the capacitors, or adding them, as well as a potentiometer in the feedback loop can help with the performance of the receiver.  With such a small circuit that is affected so much by its construction and its environment, a lot of hand tuning and experimentation will be fun, instructive, and possibly necessary to make it work best.

Simple AM Receiver Project - [Link]

One Response to “Simple AM Receiver Project”

  1. embedded Says:

    This is online project portal. You can purchase your projects online from any where in India. We’ll deliver your project at your door step within the time limit. We’ll give you whole guidance on the project you ordered. http://www.embeddedkits.co.in
    B.Tech Final year projects
    B.Tech Final year projects in Greater Noida | Final Year Project Guidance in Greater Noida | Final Year Project Training in Greater

Leave a Reply

You must be logged in to post a comment.



 
 
 

 

 

 

Search Site | Advertising | Contact Us
Elektrotekno.com | Free Schematics Search Engine | Electronic Kits