Videos
| Audio Preamplifier - Output on Oscilloscope |
About the Video -
- This video depicts the output from LM358 based preamplifier.
- A live conversation between 2 people was recorded and used as input to the preamplifier.
What is happening in there -
- First part of video depicts Preamplfier PCB, not connected to DSO. In this the output on DSO stays on the Zero Line.
- Second part depicts what happens when preamplifier's output is fed to DSO. The Zero Line has raised to 4V.
- Third part starts with a varyin shape of the output on DSO. The Earphone delivers the recorded call to the Microphone and the preamplifier works that out.
- Third part also helps hearing the actual audio stream (fed to the recording camera with the other earphone, not shown in this video). In that the earphone used to feed in the audio to the preamplifier, is taken away from the preamplifier in order to show the output.
Tools used to create this video
- Digital Camera - Canon PowerShot A710
- Editing tool - OpenShot Video Editor
Images
| Square Wave Generator - Output on Oscilloscope |
 |
- This Image depicts the output from a square wave generator, made using LM358.
- This is not a 50% duty cycle waveform. However, that does not impact the test phase.
Tools used
- Digital Storage Oscilloscope - Tektronicx TDS1002
- Digital Camera - Canon PowerShot A710
