Electronics, PCB Design and PCB Layout Daycounter, Inc.
Engineering Services

Custom Firmware, Electronics Design, and PCB Layout

                 
Electronics Design
Firmware Development
Software Development
Embedded Design
PCB Layout
Digital Signal Processing (DSP)
Reverse Engineering
Prototyping
Device Driver Development
VHDL
Motor Controllers
Microcontrollers
Data Acquisition Systems
Palm OS Software
Windows CE Software
Pocket PC Software
Design for Manufacturing
Through Hole to Surface Mount (SMT) Conversion 
Microchip PIC Consultant
MSP430 Development
DSP56 Development
RoHs Redesign
Design for USB



Silver Board Contract Assembly


Sallen-Key High Pass Butterworth Filter Calculator

Sallen-Key Filter Stage

 

This calculator calculates the capacitor values for a unity gain Sallen-Key high pass Butterworth filter. The Sallen-Key filter is a simple active filter based on op-amps stages, which is ideal for filtering audio frequencies. 

For a derivation of the design equations see this link:  

High Pass Sallen-Key Design Equations

To use this calculator, select a resistance, the number of poles, and the cut-off frequency. 

3dB Frequency (Hz)
Capacitor (C1,C2=C) (uF)
Poles:

Quadradic: S^2+As+B.

Design equations:

R1= A/(4*C*PI*f)

R2= 1/(A*C*PI*f)

Derivation:

If normalized then Wo=1 and Q= 1/A.  (See the design equation page for R1 and R2)

 

[Employment] [Downloads] [Articles] [Contact Us]

Salt Lake City, UT, USA

Disclaimer: Daycounter, Inc. doesn't guarantee the accuracy of any of it's content. Use at your own risk.

© Copyright 2016 Daycounter, Inc. All rights Reserved.






Soil Moisture Sensor Probe



Water Level Sensor