Almost all electronic devices and circuits need a dc source of power for their operation. While batteries and dry cells can be used as a form of dc power supply, their voltages are usually low and they require frequent replacement; … Read more
Tag: Analogue electronics
Gunn Diode – Features, Operation & Applications
Features of a Gunn Diode
A gunn diode is made up of only N-type semiconductor which is typically sandwiched between two metal conductors. The central section is usually lightly doped N– surrounded by heavily doped N+ layers. The … Read more
Voltage Doubler Circuit Operation
A voltage multiplier is a specialized rectifier circuit capable of producing dc output voltage which is theoretically an integer times the AC peak input, for instance, it is possible to get 200 VDC from a 100 Vpeak AC source … Read more
Clamper Circuits – Features & Applications
A clamper circuit or dc restorer is used to clamp a peak of a waveform to a specific DC level compared with a capacitive coupled signal which swings about its average DC level (normally 0 V). If the diode is … Read more
Clipper Circuits – Features & Applications
A clipper also referred to as a limiter is a circuit which removes the peak of a waveform. A clipper consists of diodes, resistors and sometimes DC sources to clip or limit the output to a certain level.
The input-output … Read more
PIN Diode – Features & Applications
PIN diode is characterized by fast low capacitance switching. A PIN diode is fabricated in a similar fashion to a silicon switching diode with an intrinsic region added between the PN junction layers. This generates a thicker depletion region, the … Read more
Diode & Filter Applications in Amplitude Modulation (AM) Detection Circuits
The operation of a typical AM audio frequency signal is illustrated in the Figure 1.0 where vin is the modulated signal that is shown Figure 1.1.
A typical amplitude modulated signal that is fed … Read more
Unijunction Transistor Features and Operation
The unijunction transistor (UJT) is a three terminal, single-junction device which exhibits negative resistance and switching characteristics totally unlike those of conventional bipolar transistors.
The UJT consists of a bar of n-type having ohmic contacts designated Base 1 (B… Read more
The Varactor Diode
DC Motor Power Op-amp Speed Controller
Let’s consider the functional diagram below:
The D/A converter outputs a voltage directly related to the potentiometer position. However, the D/A converter’s output current is limited and not enough to … Read more