Power frequency noise filter PC822 schematic


Posted on Mar 28, 2007

As shown in FIG frequency power supply noise filter circuit. The circuit is a double-T filter, can be used to amplify (such as sensors) weak signal, to mixed 50Hz (or 60Hz) pow


Power frequency noise filter PC822 schematic
Click here to download the full size of the above Circuit.

er supply frequency noise will be filtered out. If using only the RC element composed of such filter, the Q value is generally low, and the attenuation characteristic having broadband characteristics. Using op amps and add positive feedback can improve the Q value. Let Q value at this time is Q, then Q Q/(1 a K), where, K RA/(RA + RB). Changing the coefficient K can make Q value increases. The resonant frequency of the circuit is fo 1/2 RC, positive feedback element of R/2 and 2C. Taking into account the characteristics of using a capacitive decentralization, the resonant frequency to be set lower, then the potentiometer PR1 and PR2 to adjust the frequency to 50Hz (or 60Hz). When adjusting the input 50Hz (or 60Hz) sinusoidal voltage, filter it through PR adjust the output voltage to a minimum. With this filter, if the input power supply noise is not a sine wave, there will be a high-frequency component by the filter. AC power is generally higher harmonics 3,5,7 and other odd harmonics can be filtered by low-pass filter access to these harmonics.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Knight Rider Circuit
Stabilized DC Power Supply with Short-Circuit Indication
remote tester
heart rate monitor schematics
Zener diode tester
5000W ultra-light high-power amplifier without switching-mode power supply
Subcutaneous Transmitter
160 METER VFO
Comes with rechargeable lead-acid battery LED emergency light circuit diagram
For low-noise amplifier OP amplifier RIAA compensation



Top