1. Azusau

    Audio noise with MIC

    hi, I had try to use LM358 and TDA2822 to finish a audio circuit that shown as below. Now, here is a trouble that a lot of noise when I using MIC input audio signal, but it looks normal work when I using my cellphone input audio signal. there are two videos show the two condition. Audio signal...
  2. Ford Prefect

    LM358 Test circuit

    Hi guys, I tend to use quite a few LM358's in several of my circuits but I have come across some LM358's which have been faulty. I have soldered them into my circuits and after discovered that the LM358 is at fault then have the annoying task of unsoldering the LM358 and replacing it with...
  3. xavseg

    LM358 VCO Problem

    Hi everybody !! Well, I recently made the famous LM358-based VCO as in this article : https://www.allaboutcircuits.com/projects/diy-synth-series-vco/ Everything seems to work fine except those buffers which I can't get to work at all and I just can't understand why ... I've already tried...