ok,
1.- No cable. Somehow you have to mount the circuit directly as close as possible to the USB connector.
Find a way to mount the male USB connector on your amplifier board.
example of cheap shoulder USB that you can solder directly on the board
https://uk.rs-online.com/web/c/conn...ctor&applied-dimensions=4294885308,4294882805
I like RS but there are many other suppliers around.
2.- Don't use the laboratory white breadboard with pinholes, build your device directly on something like this
https://uk.rs-online.com/web/p/breadboards/1004081/
3.- As pointed above, the caising is also important. The microphone is intended to pick up mechanical
vibrations on the membrane, but without casing, the frame of the microphone picks up vibration
that in turn shake the membrane that should only receive acoustic signal.
Examples of cheap metallic small enclosures
https://uk.rs-online.com/web/p/instrument-cases/0322638/
4.- More directive microphone: The microphone is the antenna, no matter how quite
is the amplifier behind the atenna, if the antenna is not directive enough, it's going to pick up surrounding noise
that may end up drawning the signal, which is probably what is happening.
5.- another way to reduce the noise, if possible, is to get as close as possible to the source,
like journalists do, this reduces the impact of surrounding noise.
John BG
1.- No cable. Somehow you have to mount the circuit directly as close as possible to the USB connector.
Find a way to mount the male USB connector on your amplifier board.
example of cheap shoulder USB that you can solder directly on the board
https://uk.rs-online.com/web/c/conn...ctor&applied-dimensions=4294885308,4294882805
I like RS but there are many other suppliers around.
2.- Don't use the laboratory white breadboard with pinholes, build your device directly on something like this
https://uk.rs-online.com/web/p/breadboards/1004081/
3.- As pointed above, the caising is also important. The microphone is intended to pick up mechanical
vibrations on the membrane, but without casing, the frame of the microphone picks up vibration
that in turn shake the membrane that should only receive acoustic signal.
Examples of cheap metallic small enclosures
https://uk.rs-online.com/web/p/instrument-cases/0322638/
4.- More directive microphone: The microphone is the antenna, no matter how quite
is the amplifier behind the atenna, if the antenna is not directive enough, it's going to pick up surrounding noise
that may end up drawning the signal, which is probably what is happening.
5.- another way to reduce the noise, if possible, is to get as close as possible to the source,
like journalists do, this reduces the impact of surrounding noise.
John BG