[Part 1] [Part 2] [Code and Design Files]
After some promising results with the PCB loop antenna, in this post, I'm starting to look at the audio output.
The intention for the final system is to design a single PCB incorporating the power supply, radio receiver, power amplifier and antenna. But before launching in to this, I want to do as much testing and developing as possible using the modules that I have to hand.
In Part 2 I was getting reasonable signal strengths from the PCB antenna, but I hadn't really listened to the reception, except through headphones.
The TEA5767 module I used has an audio amplifier built-in, but its the now obsolete TDA1308 which is a stereo amplifier offering 80mW at 32Ω per channel. No good for driving a speaker directly.
To try out what I have so far, I had a rummage around and found an old version of the MonkMakes Amplified Speaker and connected it to the output of the radio module and to the 5V supply of the Arduino.
I was not expecting results. The Amplified Speaker, is a very low power quite tinny thing and the quality was pretty awful. Key point were:
- Terrible sound quality
- Significant hiss
- Clicks every time the Serial Monitor reported the signal strength.
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