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Switched capacitive audio filter projects • AmateurRadio.com
https://www.amateurradio.com/switched-capacitive-audio-filter-projects/
My original objective was to demonstrate, to the AM community, the use of a switched capacitor filter for “brick-wall” bandlimiting of the output of an AM audio chain… in order to limit the bandwidth of the r.f. output signal produced by a vintage high-level-modulated vacuum tube transmitter, or a modern FET-based “Class E” transmitter.
Switched-capacitor filters
https://inst.eecs.berkeley.edu/~ee247/fa10/files07/lectures/L9_2_f10.pdf
Switched-Capacitor Filter Advantage versus Continuous-Time Filter V in V out C 1 S1 S2 ...
LTC1059 - High Performance Switched Capacitor …
https://www.analog.com/media/en/technical-documentation/data-sheets/1059fd.pdf
Switched Capacitor Universal Filter The LTC ®1059 consists of a general purpose, high perfor-mance, active filter building block and an uncommitted op amp. The filter building block together with an external clock and 2 to 5 resistors can produce various 2nd order functions which are available at its three output pins. Two
AN40 - Take the Mystery Out of the Switched …
https://www.analog.com/media/en/technical-documentation/application-notes/an40f.pdf
switched-capacitor filter breadboard. The circuit is built on a copper clad board which acts as a ground plane. The switched-capacitor filter and buffer operational amplifier are well bypassed. All leads are kept as short as possible and the switched-capacitor filter clock input is through a shielded cable. The second breadboard uses a single
NESCAF Audio Filter
http://www.wb0smx.net/?p=1256
The filter uses a Switched Capacitor Audio Filter Chip (MF10, LMF100 or LTC1060 chip). Â It uses a 555 timer to create a square wave to feed the Switched Capacitor chip at about 100 times the center frequency. Â The output of the SCAF chip is fed to a typical LM386 audio amplifier chip for final output to a speaker.
Switched Capacitor Filters (SCF)
http://hasler.ece.gatech.edu/Courses/ECE3400/Proj4/UCalgary_Switch_Cap_notes.pdf
Switched Capacitor Filters (SCF) • Passive Filters • Components are R, L, C • Big, Heavy, discrete • Inductors are limited in quality • Designed in s-domain • Active RC filters • Components are Opamps, OTAs, R’s and C’s • Can be integrated on the same chip • Inaccurate RC in ICs • Designed in s-domain • Switched Capacitor Filters
N5ESE's Version of the NESCAF (20070117)
http://www.n5ese.com/nescaf.htm
Along comes the New England QRP Club, which now offers an inexpensive, but state-of-the-art Switched-Capacitor Audio Filter kit, called the NESCAF. Priced at under $30, the kit includes all this: (click on any picture to see larger version) The NESCAF uses a National MF10chip to implement a 4th-Order Butterworth Bandpass audio filter.
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