This receiver for frequencies up to 18 MHz was found in American documentation from the 1990s. Data for coil winding is aggregated.
We found this circuit in a 1977 Italian Elettronica Prática. BC107 can be replaced by BC547 and...
This circuit for 40 V systems was found in a Linear Technology application manual. The circuit...
Found in a 1968 EEE, this circuit uses transistors from that time. The output is 300 ns....