Scratch or Rumble band-pass filters are usually used to remove the hiss, pops, and ticks from worn records or tapes. Here's the reason I need one.
I repaired one of the hinges on an older laptop. At first you would hear the hissing and popping through the internal or external speakers when the hinge moved. I tried several different types of lubes. They all worked for a few days, but the static would always return. Finally the hinge completely froze-up. I removed the hinge and carefully knocked out the pin with a center punch. I reamed out the tubular inner core of the hinge that controls the friction applied to hinge pin. The hinge now operates like new. I thought all my problems were over but that darn popping and hissing has not gone away.
I don't want to mess with this laptop anymore. I could sit-down for hours in front of a breadboard trying to come up with a good scratch filter to plug-in to the speaker jack of this laptop. I was hoping there might be something I could buy factory assembled, or a least in kit form. A good schematic is perfectly ok, as long as the parts can be obtained from companies like Digi-Key or Mouser.
Remember all those data books we used to collect before the internet came along? They were filled with interesting schematics. At least
50% of the parts shown in these diagrams could only be obtained by ordering huge quantites. I guess if you worked for the companies that created these data books you could call Tom, Joe, or Bob and ask them to send over a dozen 0.01% tolerance resistors! Unless you lived a few miles from Silicon Valley, most of us had no way of obtaining these kind of exotic components.I spent about fourty-five minutes with Google, but I can't find a good kit or schematic that would do the job.
Any help would be appreciated!
Holophote