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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: signal leads that pick up less ambient noise?
Date: Fri, 21 Feb 2025 12:27:49 -0500
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"Christopher Howard" <christopher@librehacker.com> wrote in message news:87a5afnsh1.fsf@librehacker.com...
> >
>> Those boards don't look at all sophisticated. When you say building it
>> on breadboards do you mean Vero board or some other soldered
>> prototyping medium or do you mean literally on a plug in patchboard?
>>
>
> I'm use the common white breadboards where you push the leads and
> components in. I'm not sure what the technical term is for those.

I also used those as a teen for very simple things including a cat flap alarm which frightened the neighbours' cats away.
For the circuits you're making I'd use veroboard. Sometimes called stripboard.
https://electronicsclub.info/stripboard.htm
Speedwire is even better but may not be available any more and needs a surgeon's touch.
https://en.wikipedia.org/wiki/Speedwire

Try a simulated ground plane or simulated enclosure made from a sheet of metal foil, a sheet of paper or thin card and the kind of 
glue which does not set hard.
Use a paper clip to connect to the foil.

>
>> Have you checked that your bipolar 15v supply isn't the noise source?
>>
>> The noise you are describing at around 40kHz looks awfully like an old
>> school switched mode PSU sort of frequency.
>
> I checked just now, but the noise is not affected at all by turn on or
> off the bipolar 15 volt supply. As mentioned earlier, turning off
> computers at the desk, especially one older computer, eliminates most of
> the noise.
>
> -- 
> Christopher Howard