DiscoverCircuits.com, has 30,000+ electronic
circuits, cross-referenced
into 500+ categories. We have searched the web to help you
find quick design ideas.
We make every effort to link to material posted by the designer.
Please let us if you would like us to link to or post your
design.
Adjustable 60Hz Filter - On this page three adjustable notch
filters configurations are shown . They can be used in your small
pre-amp or amplifier project to filter out any HUM at 50 Hz (
European ) or 60Hz . By substituting the capacitors values in the
bridge other frequencies can be used . All op-amps configuration
requires a +/- voltage supply which can easily provided with a
voltage divider made of two…. [Stepan Novotill' website]
Basic Introduction to Filters - Application Notes on active,
passive and switched capacitor filters, document in PDF format
(app note added 4/02)
Build an adjustable high-frequency notch filter - 6-Feb-03 Issue of EDN Although
you can obtain universal, resistor-programmable switched-capacitor filters that are
configurable as notch filters, most cannot operate at bandwidths higher than 100 kHz.
Further, the typically 16- to 20-pin packages do not include a continuous-time,
antialiasing filter to prevent spurious signals from appearing at the output....
[Design Idea by John Ambrose, Mixed Signal Integration Corp, San Jose, CA]
Build an adjustable high-frequency notch filter - 6-Feb-03 Issue of EDN Although
you can obtain universal, resistor-programmable switched-capacitor filters that are
configurable as notch filters, most cannot operate at bandwidths higher than 100 kHz.
Further, the typically 16- to 20-pin packages do not include a continuous-time,
antialiasing filter to prevent spurious signals from appearing at the output....
[Design Idea by John Ambrose, Mixed Signal Integration Corp, San Jose, CA]
Closing the loop deepens notches - 7-Feb-02 Issue of EDN Notch filters remove a
single unwanted frequency from an input signal. They are also a vital component of
pulse-shaping networks, such as time-averaging filters. You can tune a state-variable
filter over a wide range by changing the time constants of its integrating amplifiers
(references 1, 2, and 3].... [Design Idea by Tom Napier, North Wales, PA]
CW Filters - Electroinic circuit design…. [from Harry Lythall's website]
Electric Field Disturbance Monitor - This schematic is the power supply and
front-end sections of the field monitor that is discussed in more detail at Electric
Field Disturbance Monitor. The system can detect human and animal motion by the
electric fields they disturb. ….
