| 29.85 MHz Notch Filter Schematic: (electronic circuit added 7/03) |
| 78 RPM and RIAA Phono Equaliser: Multi
Standard 78 RPM and RIAA Phono Equaliser handles all "standards" (added 6/07) |
| Adjustable 60Hz Filter: to filter out any HUM
that may be picked up by a noisy power supply or long wire connection (added 4/02) |
| Adjustable Audio Notch Filter:
(schematic added 9/02) |
| Akerberg-Mossberg
AM Second Order Notch inverting: (electronic design added 6/07) |
| Basic Introduction to Filters: Application
Notes on active, passive and switched capacitor filters, document in PDF format (app note added 4/02) |
| Berka-Herpy
BH Second Order Notch non-inverting: (electronic design added 6/07) |
| Build an Adjustable High Frequency Notch Filter:
02/06/03 EDN Design Ideas / (added 12/04) 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. Furr, typically 16to 20-pin packages do not include a continuous-time, antialiasing filter to prevent spurious signals from
appearing at output.... |
| Closing the Loop Deepens Notches: 05/07)/02
EDN Design Ideas / (added 12/04) 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). ... |
| CW Filters: (electronic circuit
added 7/03) |
| Easy Parametric and Graphic Eq's Plus
Peaks and Notches: (circuit / schematic design added 6/06) |
| Fliege
Second Order Notch non-inverting: (electronic design added 6/07) |
| Helical Notch Filter:
(electronic circuit added 10/06) |
| Helical Resonator
Notch Filter: (electronic circuit added 7/03) |
| High Q Notch Filter: National Semiconductor
Application Notes first published28-Jun-1996 (app note added 4/02) |
| High-Q 60-Hertz Notch Filter: This
high-Q notch filter is based on the "Twin-T" design. It produces a very deep notch in the response curve at about 59.7 Hz. This is useful to remove 60-Hz hum and noise from audio
recordings or live performances. Response is down over -60db at the center point. The LM3900 Norton opamp was chosen since it doesn't require extra components for single-supply
operation.... (circuit design added 7/06) |
| KHN
Inverting Input Second Order Notch non-inverting: (electronic design added 6/07) |
| KHN
Non-Inverting Input Second Order Notch inverting: (electronic design added 6/07) |
| LB-5: High Q Notch Filter: National Semiconductor Application
Note (app note added 2/06) |
| Mikhael-Bhattacharyya
MB Second Order Notch non-inverting: (electronic design added 6/07) |
| Notch Filter is DC Accurate:
03/02/95 EDN Design Ideas / (added 7/02) |
| Notch Filter is Insensitive to Component Tolerances:
03/02/00 EDN-Design Ideas / (added 2/06) |
| Notch Filter uses Only Lowpass Filters:
04/10/97 EDN Design Ideas / (added 6/06) |
| Notebook Power Supply has Two Outputs:
03/03/94 EDN-Design Ideas / (added 3/06) The notebook-computer supply in Fig 1 powers the 5V logic and derives an adjustable -24V supply for an LCD's backplane. The design uses only a
high-efficiency buck regulator (Si9150) and an NMOS/PMOS, dual-power-FET chip set (Si9943), eliminating the extra parts required when you implement both supplies independently. Because of
the low on-resistances of the dual FETs, this circuit can achieve better than 92% efficiency at 7.2V input and full-load output (7.6W).... |
| RC Notch Filter Twin
T: The twin T notch filter can be used block an unwanted frequency or if placed around an op-amp as a bandpass filter. The notch frequency occurs where the capacitive reactance
equals the resistance Xc=R and if the values are close, the attenuation can be very high and the notch frequency virtually eliminated. (added 4/02) |
| Reverse RIAA Equaliser: Test phono preamps
for correct equalisation, or convert unused phono inputs. (circuit added 6/07) |
| Sallen-Key SK
Second Order Notch non-inverting: (electronic design added 6/07) |
| Simple Easy Parametric and Graphic Eq's
Plus Peaks and Notches: (circuit / schematic design added 6/06) |
| Switched-capacitor IC forms notch filter:
09/30/99 EDN-Design Ideas / (added 10/06) |
| Twin T Notch Filter: This
filter allows you to remove frequency band from a signal. In the example below, we'll design a 50Hz notch filter. This allows us to remove the 50Hz hum picked up by, say, a microphone
cord. Of course, it can be easily designed for 60Hz as well. (added 2/06) |
| Twin-T
Second Order Notch I non-inverting: (electronic design added 6/07) |
| Twin-T
Second Order Notch II non-inverting: (electronic design added 6/07) |
| Variable notch filter with both high
and low pass filters: (schematic / circuit added 2/07) |
