XYL-Gigi has purchased the TV, DVD player, and speakers with built-in amplifier that he has always wanted! He had been saving money for months.
The problem then was the speaker inside the amplifier. I was going to buy a cheap one made in China for karaoke, so I let him choose a SHARP one that cost about twice as much.
This is because, by and large, the output of cell phones in this country can easily cause an amplifier to interfair! Sure enough, the cell phone and 7MHz and 14MHz cause amp eye on the amp I have purchased!
So I called on Sharp's services and said, "I trusted Sharp and bought it, so please do something about it.I pressed him to say, "I'm sorry, The only thing they suggested was, "Put AVR in it." (Incidentally, even if a UPS is connected to the power line and powered by a battery, there will still be a wrap-around.
So Lotlot and I started looking inside.
Symptoms are that high-frequency waves easily come around from the connection cable even if the power of the wireless microphone receiver connected to the microphone terminal is turned off and on. Generally, just plugging the cable of the wireless microphone receiver into the microphone jack of the loudspeaker will obviously increase the noise!
However, I also added a noise filter to persuade the Sharp engineers, who were skeptical about the power supply line.
However, since I just couldn't get a toroidal core, I disassembled my computer's power supply and put in a coil I took out! But that didn't stop Amp I.
Note that no Amp I is generated on the LINE input terminal side from the DVD player (right side) other than the microphone terminal (left side). The amplifier contained two operational amplifiers LM-324 and an IC called HT8970 I think I have a clue here.
I think I will be friends with this amp for a while to come!
Well, I can see why the microphone side has higher gain. The output of the wireless microphone amplifier is deliberately lowered to the level of the microphone, and then amplified again by this OP amplifier.