RC oscillator


Posted on Feb 5, 2014

Linear electronic oscillator circuits, which generate a sinusoidal output signal, are composed of an amplifier and a frequency selective element,a filter. An oscillator circuit which uses an RC network, a combination of resistors and capacitors, for its frequency selective part is called an RC oscillator. Two configurations are common. One is called a Wien bridge oscillator


RC oscillator
Click here to download the full size of the above Circuit.

(pronounced `vEn and therefore often misspelled as "Wein Bridge"). In this circuit, two RC circuits are used, one with the RC components in series and one with the RC components in parallel. The Wien Bridge is often used in audio signal generators because it can be easily tuned using a two-section variable capacitor or a two section variable potentiometer (which is more easily obtained than a variable capacitor suitable for generation at low frequencies). The archetypical HP 200 audio oscillator is a Wien Bridge oscillator. The second common design is called a "Twin-T" oscillator as it uses two "T" RC circuits operated in parallel. One circuit is an R-C-R "T" which acts as a low-pass filter. The second circuit is a C-R-C "T" which operates as a high-pass filter. Together, these circuits form a bridge which is tuned at the desired frequency of oscillation. The signal in the C-R-C branch of the Twin-T filter is advanced, in the R-C-R - delayed, so they may cancel one another for frequency If they are to produce an undistorted sine wave, RC oscillators usually require some form of amplitude control. Many common designs simply use an incandescent lamp or a thermistor in the feedback circuit. These oscillators take advantage of the fact that the resistance of the tungsten filament of the lamp increases in proportion to its temperature, a thermistor works in a similar fashion. Operated well below the point at which the filament...




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

GSM Automatic Meter Reading
Power-line frequency meter
High speed sample and hold
Isolated-dc-dc-converter
Digital Calender Circuit
in making incandescent lamps
computer-internet-software
Make a USB color changing light
Head light high beam the dimmer relay or the fuses for that circuit
Device that it is self-running
FPGA / CPLD 16x2 LCD Interface Circuit



Top