Found in documentation from the 1980s, this circuit can have several adaptations to use modern transistors and LEDs instead of the lamp. The power supply voltage can also be changed.
This converter for the 150 MHz band was found in an American documentation. Transistors are...
The configuration shown is from the National Semiconductor Linear Applications Handbook. The...
We found this circuit in a 2003 publication. The indicated coil is for capturing the signals in an...