This circuit with unijunction transistors was found in a documentation from the 80's. The trigger times of the SCRs depend on the capacitors and are adjusted in the 5M (4M7) potentiometers.
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...