This circuit was found in a British documentation from 1969. It can be implemented with modern transistors. The pass band is 6 MHz.
Found in an Elektor from the 90s, this circuit is based on components that are still common today....
Used in audio circuits in the excitation of output stages, this circuit provides audio signals with...
This circuit is from a manual from the 80's and the operational one used, uncommon nowadays, can...