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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: RE: Please help posted by Chodywalker@gmail.com on January 20, 2017 at 02:30:59:
If you're in the US, Harbor Freight has little DVMs for about five bucks. Sometimes they give them away with the purchase of something else.
First thing to do is check and see if it reads zero with no input, and bring some kind of battery with you to make sure it actually reads. Do this in the parking lot, if it is defective they will replace it immediately.
As far as checking it, that is a little bit more tricky. With the woofer still out, find some program material with practically no bass and set the settings where you had themm when the woofer fried. The reading will fluctuate but that little minus sign at the left should be on and off about equal times. If it is always positive or always negative that means there is DC on it.
The reason to find something with no bass and actually have the gain up is because the circuitry in the phone might be like in a hearing aid, strictly single ended. They do this because of the lower component count and the speaker in the hearing aid provides for an inductive load. going into electronics the load will be resistive, but is usually capacitor blocked so at DC should be higher. you don't have the means to actually measure the input impedance of the amp though so it has to be done in a roundabout way.
With a (the) cable, two capacitors and four resistors a DC blocker can be built in minutes. anyone who works on electric guitars should be able to do it so a music store might be the idea here.
Another thing is if the amp does have a "DC" switch you can just set it to OFF, however if it ever gets inadvertently bumped into DC mode again you'll have the same problem. An ounce of prevention is better than pounds of speakers.
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Follow Ups
- RE: Please help - JURB 08:56:17 01/20/17 (0)
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