We’re talking of course about the carbon microphone amplifier, a piece of telephone technology which made its way into consumer electronics. The carbon microphone is a container of loosely ...

Instead, this design relies on a dual OPA1642 op-amp, with its low quiescent current meaning it’s perfect for running off phantom power. This means the microphone needs no batteries, and using a ...

mainly because of the lack of any kind of on-board pre-amp and ability to boost the gain on the mic itself. I found that while in USB mode, you had to max out the gain on the microphone ...