Buy some earplugs.
Or more seriously, most likely, the part you are interested in is a monolithic circuit stuck to a circuit board with a blob of epoxy. If that is the case, there is little you can do except possibly see if a different microphone helps.
More of a long shot: If some of the circuitry is exposed, tell us about it, or even better post a circuit diagram and maybe somebody can recommend circuit changes.
Ok, what you're going to need to look at are probably the resistors going to that chip. Could you tell us what the numbers are on the chip? Once we figure that out, it shouldn't be too hard to mod the design.Took the Spencer gift globe apart. Looks like we have a small mic in there picking up sound above 2 sections of plastic on the inside of the base. Any thoughts on making the sensitivity better? Did any one try to move the mic to the outside??? Thanks Ron
Ok, what you're going to need to look at are probably the resistors going to that chip. Could you tell us what the numbers are on the chip? Once we figure that out, it shouldn't be too hard to mod the design.
That's weird. I posted here, but now it's disappeared....
Anyway, what I said was pretty much what AG mentioned. The mic is picking up interference (stray electricity) from the globe and it's constantly triggering the audio circuitry. You can see the electric charge if you place a coin on top of the globe and touch it with another coin. You'll see the spark.
I would not have removed the mic, personally. I have a feeling the chip is acting as the audio amplifier, and at least one of the resistors going to it adjusts the sensitivity. Knowing what the numbers on the chip are would help a lot.
Hmm, I wonder why there's a hex inverter in a plasma globe. I suppose they could be using it as an audio amplifier...Switched the wires on the mic to see what would happen but after doing so the mic didn't work so I put it back again. Should I try to use some shielded mic wire? The chip says HEF4069UBP, L2A4D2 21,
UNG12125, NXP. Does this help anything? Should I try the shielded wire or just put the mic back in. SEE PIC. Thanks Ron
Switching the wires connects the microphone backwards so of course it doesn't work.Switched the wires on the mic to see what would happen but after doing so the mic didn't work so I put it back again. Should I try to use some shielded mic wire?
You'll need a larger transformer (i.e. 12vdc, 2 amp) to be sure you can source enough current to power the plasma globe and the color organ. My guess is you were trying to draw too much from the transformer and the inner windings got too hot and burnt.APPRECIATE all the suggestions. I couldn't follow what most were saying so I put it back to factory with mic inside. I built a color organ kit to plugged the ball into it but after 1 hour the transformer for the plasma ball burnt up and stopped working. It was working great before this but with not as much viewable spark activity. Any thoughts on how to solve the transformer problem? Its 12vdc 830mA. Trying it now with a 12vdc 500mA and its working without plugging into the color organ controller which I'm sure will burn the transformer out faster.
You'll need a larger transformer (i.e. 12vdc, 2 amp) to be sure you can source enough current to power the plasma globe and the color organ. My guess is you were trying to draw too much from the transformer and the inner windings got too hot and burnt.
Thankyou very much