Receivers and Receiver Applications 1.1
Simple Crystal Receiver
; 1.2 Push-Pull Crystal Receiver: 1.3 Bandpass Crystal Receiver; 1.4 Use of Audio Amplifier with Crystal Sets; 1.5 Crystal Video Detector: 1.6 Crystal DC Re- storer for Television: 1.7 Second Detector A.V.C.
Can germanium diode be used as a rectifier?
An ideal diode provides zero resistance in forward bias and infinite resistance in reverse bias. Rectifier requires this characteristic. Germanium diode
is very close to these characteristics
and hence, can be used in rectifier.
What is in germanium diode?
A germanium diode is
a diode made using the element Germanium in stead of Silicon (Silicium)
. While both perform the same function (they only let current pass through them in one direction) there are some differences between the silicon and germanium variants. The most obvious is the forward bias voltage.
Where are diodes used in everyday life?
The application areas of diodes include
communication systems as limiters, clippers, gates; computer systems as logic gates, clampers
; power supply systems as rectifiers and inverters; television systems as phase detectors, limiters, clampers; radar circuits as gain control circuits, parameter amplifiers, etc.
What is the difference between germanium and silicon diode?
A Silicon Diode is a semiconductor that has both positive and negative charge polarity and can allow an electrical current to flow in one direction whilst restricting another. A Germanium Diode works in the
same way
but has a low forward voltage which results in it being a low power loss and an efficient diode.
Is zener a diode?
A Zener diode is
a silicon semiconductor device that permits current to flow in
either a forward or reverse direction. The diode consists of a special, heavily doped p-n junction, designed to conduct in the reverse direction when a certain specified voltage is reached.
What is the most common diode?
The most commonly used signal diode is the
1N4148
. This diode has a close brother called 1N914 that can be used in its place if you can’t find a 1N4148. This diode has a forward-voltage drop of 0.7 and a peak inverse voltage of 100 V, and can carry a maximum of 200 mA of current.
Which is better silicon or germanium?
In present,
Silicon is preferred over Germanium for semiconductor
. The reason is, Silicon can be worked at a higher temperature as compared to germanium. … The structure of Germanium crystals will be destroyed at higher temperature.
What is the purpose of diode?
A diode is a semiconductor device that essentially acts as
a one-way switch for current
. It allows current to flow easily in one direction, but severely restricts current from flowing in the opposite direction.
Why do we prefer silicon over germanium?
Why is silicon usually preferred to germanium in the manufacture of semiconductor devices?
Silicon is abundant on the earth’s surface and therefore cheaper than germanium
. The PIV (Peak Inverse Voltage) rating of silicon is much higher than germanium and therefore can withstand much higher temperatures than germanium.
How do you convert AC to DC?
The most common way to convert alternating current into direct current is to
use one or more diodes
, those handy electronic components that allow current to pass in one direction but not the other. Although a rectifier converts alternating current to direct current, the resulting direct current isn’t a steady voltage.
Can I use any diode?
In almost all cases,
no
. Most diodes will be at around 0.7 to 1 volt of forward voltage, (almost) regardless of current and breakdown voltage. However, higher voltage ratings often come with a higher forward voltage drop and (at equal current into the load) higher power losses.
What is an example of a diode?
An example of a diode is
a light-emitting diode, an LED
. … Diodes are used as temperature and light sensors and light emitters (LEDs). In communications, they filter out analog and digital signals from carriers and modulate signals onto carriers.
What is the function of silicon diode?
A diode is a widely used two-terminal circuit element that
minimizes current flow in one direction
(reverse bias), while easily carrying current in the other direction (forward bias). A semiconductor material that changes abruptly from p-type to n-type has this property.
Why is a diode put in parallel with an LED?
The diode in
parallel could be there to protect the LED against reverse breakdown voltage
. During the reverse cycle the voltage around the LED will be 110V, since only a tiny amount of current flows in reverse.
