This third-order Butterworth filter was found in American documentation from the 1980s. Formulas for component calculations are attached to the diagram.
For those who like electronic music or special effects on their sound equipment, we have here an...
This sensitive medium wave (MW) radio pick up the local station without the need of an external...
This circuit is from a 1965 Motorola manual. It can be implemented with a common 2N2646 and a 106...