How exactly does a paper cup phonograph do this?
According to the physics teacher's introduction:
The work of the phonograph is to record and playback sound caused by the bottom of the paper cup vibration, and the bottom of the cup to drive the steel needle with the sound vibration of this vibration of the steel needle, and in the rotation of the paper cup carved out the sound vibration of the traces of the sound, and then in the movement of the sound track on the steel needle by the sound track of the original record of the voice, and ultimately lead to a signal to act and vibrate and drive the vibration of the cup! Sound.
That is to say: when you fixed a steel needle on the bottom of the cup of paper cups, speak to the paper cups, the vibration of the sound caused by the vibration of the bottom of the cups, the altered steel needle in the plastic under the traces; restored so that the tip of the steel needle to the sound track, and then rotate the quilt, driving the bottom of the paper cups vibration, then at the beginning of the words you said will be spread out.
The above is the principle of phonograph production, so students learn physics is very key, not only can open up students' thinking, but also in daily life to give full play to the wisdom to do some small inventions.
Isn't it amazing? Is it also want to do a phonograph?
Here are the general steps on how to make a needle phonograph by hand.
Materials and tools to be prepared:
1. a disc to hold the record;
2. the motor and belt of a tape player, some rotors;
3. a sewing needle;
4. a bracket made of aluminum;
5. a piece of copper bar;
6. a drink bottle;
One 7.5V cell phone charger to be used as a motor power source (the old ones were hand cranked clockwork turned).
Then the next is:
Old record tape machine off the motor, belt and some rotors, the motor drives the rotors to do a deceleration.
The runner drives the disk to do the secondary deceleration, to achieve the required speed of the record and uniform speed.
The large disk that holds the record.
A sewing needle is placed solidly in the front of the brass bar, which is the pickup head.And then the other end is inserted into the cap of a beverage bottle to produce a **** chime, which is the horn.
Use wire to thread a small hole in the end of the beverage bottle and prop it up so that the head can pan inside and out on the turntable, so a simple phonograph is DIY complete.
Go ahead and try it out!