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I am using the following circuit to make a computer microphone. The "speaker" component is the computer's microphone input. The problem with this circuit is that somehow I can hear capacitors discharging or something similar https://vocaroo.com/i/s1U2NhEnlQaa. I have also started to believe that some kind of aliens are trying to communicate with me when I am touching the board https://vocaroo.com/i/s0wLsUYS8Rym. How can I "cut" these peaks and prevent aliens interrupting to my signal?

schematic

simulate this circuit – Schematic created using CircuitLab

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  • \$\begingroup\$ Did you build it on a breadboard? \$\endgroup\$ – JRE Dec 26 '17 at 9:15
  • \$\begingroup\$ Ouch. Let's get quantitative. What is the input voltage range of the mic, what is the gain of the amplifier, and what is the expected input voltage range of the computer's microphone input? \$\endgroup\$ – replete Dec 26 '17 at 9:22
  • \$\begingroup\$ 1. The pops sound like bad connections - very possible (and expected, even) on a breadboard. 2. The "alien sounds" are either oscillations in the circuit itself or else radio intereference being picked up by the wires in the circuit. Breadboards contribute to both of those - oscillations because breadboards tend to have capacitance between pins and picking up radio signals because the wires used on breadboards can be long enough to act a antennas. The amplifier has enough amplification to make low level oscillations or interference seem very loud. \$\endgroup\$ – JRE Dec 26 '17 at 9:40
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    \$\begingroup\$ WHy is that pot connected where it is \$\endgroup\$ – Trevor_G Dec 26 '17 at 9:53
  • \$\begingroup\$ @JRE I have built it on a prototyping board(you know the one with the holes), I am still working on the pcb version, I wanted to make sure that it is working first. So you are saying that if I print it on a pcb is gonna improve the quality of the sound? \$\endgroup\$ – DrunkProgrammer Dec 26 '17 at 11:56
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Carefully placing the wires would fix the problem just make it should that no positive or output wire is near to ground wires even if they are insulated

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