Analyzing the response Mic pre-amp and equalizer (Part 4) 

Analyzing the response of the microphone pre-amp and equalizer using the PC Sound Card and REW software.
Part 1 - Project introduction: • Mic pre-amp and equali...
Part 2 - Technical details and build: • Mic pre-amp and equali...
Part 3 - Added functionality: Noise Gate, Auto Make Up gain, better compressor and Limiter: • Mic pre-amp and equali...
Part 4 - Analyzing the response of the device (this video.)
00:00 - Summary
00:20 - Channel intro
00:44 - Video intro
00:55 - Inspiration for the testing platform
01:30 - Room Equalization Wizard (REW)
02:30 - Computer connections setup
03:30 - Calibration completed
03:53 - Testing the setup with a line isolation transformer (600:600 ohms)
04:23 - Results of the first transformer swept
05:30 - Reversing the connections and testing the impact on the phase
06:25 - Connecting the Mic Pre-Amp and begin the response analysis
08:11 - Surprises after first swept and a discovery
09:15 - First live sweep of the device
10:00 - Second sweep with high input level
10:50 - Auto Make Up gain sweep
11:27 - Setting the noise gate floor and visualizing on the spectrum display
12:05 - 3.3 kHz equalization tests
12:48 - 2 kHz to 4 kHz sweep and equalizer switching
13:20 - Full sweep uncovers EQ level drop across its passband
14:30 - Testing response on 1.3 kHz EQ from -12 dB to +12 dB
15:20 - Glitch on the EQ level setting
16:20 - Closing
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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