confused by background radiation
Jun. 11th, 2016 11:28 am![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
solarbirdA really weird thing is happening with the crystal mic. I do NOT understand this.
The same circuit board taken from another box and put in this box is much noisier. Like, 15-20db noiser. Both boxes are metal or metal-lined, and I’ve checked – repeatedly -the metal lining on this one is grounding.
This is true even with no crystal element attached.
Also, any board put in this box is quieter – less signal. This makes even less sense.
I’m so confused.
This is part of a collection of posts on building microphones and microphone-related kit, such as mic pre-amps.
Mirrored from Crime and the Blog of Evil. Come check out our music at:
Bandcamp (full album streaming) | Videos | iTunes | Amazon | CD Baby
no subject
Date: 2016-06-12 02:45 pm (UTC)The engineering solution is to thoroughly alter the problem box's dimensions with a very large hammer. :-)
WINNAR!
Date: 2016-06-12 05:15 pm (UTC)Taking the circuit entirely out of the box didn't help, but moving it further from the box did. I really don't get that.