A magnetic loop antenna for 40 to 17m local & DX contacts from tight spaces
Class A JFET Opamp Circuit
First Generation design that means it is not our latest design. …
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20KHz Butterworth active filter using Linear Technology LT1124, LT1355 or LT1169
This file will be usful for anti-aliasing or band limiting in an audio system. The op amp is a Linear Technology, LT1123, LT1355, or LT1169…
HIGH PASS ACTIVE FILTER COLLECTION
This is a collection of inverting and non-inverting active high pass filter circuits. I included one, two three, four and six pole filter circuits. You can change the component value ratios shown to achieve any frequency cut-off you may need. The circuit does not specify an operational Amplifier. The circuits should be used to select the needed resistor and capacitor components for a particular frequency knee and slope.
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