halojoy said:
My OPamps doesn't make a sound - dead quiet.
If they did make sounds - I'd be totally crazy. 😀
I do not like Cables, that makes sounds either,
hope I never meet any of those.......
My music make sound from the speakers. 😉
/halo - probably an exception
- having dead quiet components - as far as his ears go 😎
I was fixing a cheap car amp for a friend (broken solder joint on inputs) and was surprised at the amount of sound coming from the amp when playing into a resistor. I could actually tell what song was playing. It seemed to be mainly coming from caps and the inductors in the power supply. The amp was labeled 400 watts, and I wanted to see how bad they lied. I hooked it up to a pair of 4 ohm resistors, and turned it up until it was clipping really bad. It was only doing something like 30W/channel.
Darrell Harmon
dlharmon said:
You have magnetic forces which creates movements. An amp can be real loud in that sense. I remember when I tested my 2x300 W and 2x500 W amp at full power (with water cooled resistors).
MICROPHONES - TYPES & PRINCIPS
And we all know that microphones & woofers
work both ways! 😎
So microphones can produce Sounds
as can Capacitors!
------------------------------------------------------------
Capacitor (condenser):
Capacitor microphones are made by forming a capacitor between a stationary metal plate, and a light metallic diaphragm. When an acoustical pressure impinges on the diaphragm, the diaphragm moves and causes the distance between it and the stationary plate to change. As mentioned in a previous section, this will change the capacitance of the device. In order to measure the capacitance, one must apply a charge to the device. When this is done, the change in capacitance will result in a change in the voltage measured across the device since
Electret and Piezoelectric:
Electret microphones are capacitor microphones which use an electret material between the plates of the capacitor. As mentioned earlier, electrets are materials with a permanent polarization, and hence surface charge. A benefit to using electret microphones is that they do not need any external circuitry to create the charge, and hence are much easier to use. Many high quality, low cost electret microphones are available currently.
As discussed previously, piezoelectric crystals are crystalline structures which are similar to electrets in that they exhibit a permanent polarization of the individual cells. It is possible to use piezo sensors as microphones as well. Since they are in the form of a thin film, they are very useful if one is interested in detecting surface vibrations of an object.
Source:
Microphones - Overview of ALL TYPES
/halo - sometimes contributes some good info
Capacative microphones are used!dlharmon said:
And we all know that microphones & woofers
work both ways! 😎
So microphones can produce Sounds
as can Capacitors!
------------------------------------------------------------
Capacitor (condenser):
Capacitor microphones are made by forming a capacitor between a stationary metal plate, and a light metallic diaphragm. When an acoustical pressure impinges on the diaphragm, the diaphragm moves and causes the distance between it and the stationary plate to change. As mentioned in a previous section, this will change the capacitance of the device. In order to measure the capacitance, one must apply a charge to the device. When this is done, the change in capacitance will result in a change in the voltage measured across the device since
Electret and Piezoelectric:
Electret microphones are capacitor microphones which use an electret material between the plates of the capacitor. As mentioned earlier, electrets are materials with a permanent polarization, and hence surface charge. A benefit to using electret microphones is that they do not need any external circuitry to create the charge, and hence are much easier to use. Many high quality, low cost electret microphones are available currently.
As discussed previously, piezoelectric crystals are crystalline structures which are similar to electrets in that they exhibit a permanent polarization of the individual cells. It is possible to use piezo sensors as microphones as well. Since they are in the form of a thin film, they are very useful if one is interested in detecting surface vibrations of an object.
Source:
Microphones - Overview of ALL TYPES
/halo - sometimes contributes some good info
in the 823's datasheet, there's a headphone amp shematicsonnya said:
so, it could work
sonnya, since you told me about the 823 and the 8532, wich one is better?
Burr Brown = TI
Yes, Texas Instruments bought Burr Brown for about $90/share 3 years ago. They still seem very committed.
TI Also owns Unitrode which seems to have been a pretty good fit with their power devices business.
Jack
Yes, Texas Instruments bought Burr Brown for about $90/share 3 years ago. They still seem very committed.
TI Also owns Unitrode which seems to have been a pretty good fit with their power devices business.
Jack
The AD823 have a current limit of 15mA - into 16Ohm gives you a peak level of 1.8mW where it WILL CLIP!!!
The AD8532 will be able (because of the +/-250mA) to deliver 500mW into 16Ohm but it will clip due to supplyvoltage at 180mW... This is 100 times higher and you have a current limit margin of 100mA.
I would be surprissed if the AD8532 will not perform better because of the higher dynamic range.
Sonny
The AD8532 will be able (because of the +/-250mA) to deliver 500mW into 16Ohm but it will clip due to supplyvoltage at 180mW... This is 100 times higher and you have a current limit margin of 100mA.
I would be surprissed if the AD8532 will not perform better because of the higher dynamic range.
Sonny
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