Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
27 Cards in this Set
- Front
- Back
Front (Term) |
Capacitor |
|
|
Capacitor |
Two metal plates with a space between them |
|
|
When does the impedance of a capacitor decrease ? |
As the frequency of the alternating current decreases |
|
|
T/f
A capacitor blocks high frequencies and passes low frequencies |
False- it blocks low frequencies and passes high frequency |
|
|
When does the impedance of an inductor increase? |
As the alternating current increases |
|
|
What effect does the combination of a capacitor and inductor have? |
Minimal effect on the middle and blocks both high and low frequency |
|
|
What is a transistor? |
A solid-state semiconductor made of silicone |
|
|
Doping |
Adding an impurity to semiconductor |
|
|
What does impurity do? |
It lets neighboring Atoms share electrons in the outer shell or attracts neighboring atoms |
|
|
What does doping a semiconductor with antimony phosphorus or arsenic create |
An N-type (Negative) semiconductor with an excess of electrons |
|
|
What does doping with boron, aluminum or gallium create |
A P-type (positive) semiconductor with an electron deficiency |
|
|
What does an N type semiconductor sandwiched between two P type semi conductors produce |
PNP junctions |
|
|
What is the middle of the sandwich called |
The base |
|
|
What are the outer portion of the sandwich called |
The EMitter in the collector |
|
|
T/F
NPN junctions sandwich the P type semiconductor in the middle creating an excess of electrons permitting electron current |
True |
|
|
What are transistors |
They're amplifiers that allow current to pass in one direction and increase the flow of current passing through them |
|
|
When the microphone transduces acoustic energy into electrical energy where does the energy pass through |
The transistor |
|
|
What does the transistor convert the current from the battery into |
A large desired output current |
|
|
T/f
The output current to the transistor strongly influences the input current |
For the input current influences the output current |
|
|
Is a microphone input or an output transductor |
Input |
|
|
How does the microphone change energy |
It changes acoustic energy to mechanical energy then to electrical energy |
|
|
Is the receiver an input or output transducer |
Output transducer |
|
|
How does the receiver convert the modified electrical signal |
Electrical energy to acoustic energy |
|
|
What is the most versatile microphone for hearing instrument use? |
The electret microphone |
|
|
Name some Omni directional microphones |
Magnetic ceramic electret |
|
|
How are Omni directional microphones classified |
By physical design magnetic ceramic electret |
|
|
How are directional microphones classified |
By their polar pattern |
