DIY PreAmp Ground Noise/Loop/Hum/Buzz/Distortion

John_2016

Joined Nov 23, 2016
55
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
 

Thread Starter

Vipul Kumar 1

Joined Oct 20, 2018
79
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/connectors/usb-d-sub-computing-connectors/type-a-usb-connectors/?searchTerm=USB connector&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
sorry John But i cannot do that how can i solder it until n unless i get the prototype of it is perfect if it works on prototype bread board it will definetly work on circuit as wel
i am requesting you to try my schematic on your breadboard and find a solution for this if find that problem gone with some changes or with adition component send me the updated schematic here
it is only request John
 

atferrari

Joined Jan 6, 2004
4,672
sorry John But i cannot do that how can i solder it until n unless i get the prototype of it is perfect if it works on prototype bread board it will definetly work on circuit as wel
i am requesting you to try my schematic on your breadboard and find a solution for this if find that problem gone with some changes or with adition component send me the updated schematic here
it is only request John
Hola Vipul,

I do not discard that some words could sound different to everyone participating in this thread. Let me tell you that your request is kind of weird. Why don't you try in your breadboard whatever advice you get?

Get your hands dirty; that is where your experience will come from. Otherwise, getting sure-fire recipes only, will make of you a 1st class kit builder.;)
 
Last edited:
Top