Ujt as relaxation oscillator, Electrical Engineering

Assignment Help:

UJT as relaxation oscillator:

The UJT relaxation oscillator is shown in fig. it consist of a UJT and a capacitor C which is charged through a variable resistance R when VBB is switched ON. R1 and R2 are the external resistances such that R1 << R2, R1 is less than 50. The inclusion of these resistances provides spike waveforms. Here the negative resistance region of the UJT is used. The discharge of the capacitor through UJT develops a saw tooth output as shown in fig. when the circuit is switched on, the capacitor c starts charging through R. during charging period, the voltage across capacitor increases in an exponential relation till it reaches the peak point voltage VB. At this instant of time UJT switches to its slow resistances conducting mode. So, the capacitor small due to small valued of R1 so C discharges abruptly. As the capacitor voltage condenser stars charging again and the next cycle begins.


Related Discussions:- Ujt as relaxation oscillator

Game theory, an example and code for bargaining problem

an example and code for bargaining problem

Split-phase or resistance-split-phasemotor, Q. Split-phase or resistance-sp...

Q. Split-phase or resistance-split-phasemotor? Split-phase or resistance-split-phasemotors: Split-phasemotors have two statorwindings (amainwinding and an auxiliarywinding)with

Choose compensating components for the circuit, Q. Figure gives the frequen...

Q. Figure gives the frequency-response graphs for a 709 op amp. Choose compensating components for the circuit to have a gain of 100 and a frequency response of up to 100 kHz.

Explain the properties and application of glass, Explain the properties and...

Explain the properties and application of glass. Glass: Ordinary glass is a fine insulator but is too brittle to be used for anything although scientific instrument parts, accu

Design a circuit using real components, The circuit shown below is a protot...

The circuit shown below is a prototype 4 th - order low-pass filter which is required to meet the specification given. However the specification is not met due to inadequate atten

Determine excitation voltage and power angle, A 500KVA, 6 pole, 500v, 3 pha...

A 500KVA, 6 pole, 500v, 3 phase, wye-connected synchronous generator has a synchronous impedance of 0.1 + j1.5 ohms per phase. If the generator is driven at 1000 r.p.m., what is th

Introduction to power systems, Q. Introduction to power systems? Thomas...

Q. Introduction to power systems? Thomas A. Edison's work in 1878 on the electric light led to the concept of a centrally located power station with distributed electric power

Obtain an expression for the induced emf, Q. Consider a conducting loop of ...

Q. Consider a conducting loop of length l and width w, as shown in Figure, rotated about its axis (shown by the broken line) at a speed of ωm rad/s under the influence of a magneti

Wireless and communication, With a maximum excess delay of and a chip durat...

With a maximum excess delay of and a chip duration of , the multipath components fall in delay bins. This means that we experience leakage of energy between chips and the channel i

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd