Mic pre-amp and equalizer with DSP audio compressor (Part 2) 

Presenting a ham radio (and CB) microphone pre-amp and equalizer with DSP audio compression capabilities using a Teensy microcontroller and Teensy Audio Shield.
Part 1 - Project introduction: • Mic pre-amp and equali...
Part 2 - Technical details and build steps (this video)
Part 3 - Compressor, Limiter, Noise Gate, Auto Make Up gain: • Mic pre-amp and equali...
Part 4 - Analyzing the response of the device: • Analyzing the response...
00:00 - Summary
00:16 - Channel intro
00:40 - Microcontroller projects for amateur radio book
01:46 - Equalizer details
02:11 - High level Compression concept
03:06 - List of parts needed
05:45 - SGTL5000 Audio Codec IC high level diagram
07:22 - Pre-amp block diagram
09:18 - Software audio library architecture
11:08 - Microphone used for testing the pre-amp
14:00 - Assembling the pre-amp
22:45 - Final considerations
Code: github.com/VA3HDL/DSP_Pre_Pro...
Parts List
========
- Teensy 4.0 USB Microcontroller Development Board
- Audio Adaptor Board for Teensy 4.x (SGTL5000 Audio Codec IC)
- OLED 128x64 screen or better
- Encoder with push button
- Headers male/female for connections
- Perfboard
- 600:600 ohms isolation transformer (1:1)
- 7x 0.1uF ceramic capacitors for RF filtering
- 1uF electrolytic capacitor
- LM317 or LM7805 to regulate input voltage to 5v DC
- 2x RJ45 jacks
- Wire for jumpers
- Shielded wire for audio jumpers
- Project box or PVC sheet to build your own box
Teensy Audio Library GUI tool: www.pjrc.com/teensy/gui/index...
► If you have any questions or comments please leave them below
► For more articles and information about my other projects please check my website www.va3hdl.com

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