This circuit is suggested by American documentation from 1970. It makes use of transistors of the time but can be implemented with modern equivalent transistors.
We found this shield circuit in the SGS Integrated Circuits Manual of 1982. The circuit is...
This circuit with transistors and a crystal microphone appeared in Radio Electronics magazine in...
This circuit amplifies the signals in the UHF band starting at 470 MHz, reaching just over 900...