We found this circuit with JFETs in a Radio Electronics magazine from June 1969. The circuit has its assembly described in a complete article. Equivalent transistors can be used.
This flashing allegory with 555 integrated circuits was found in the Radio Electronics...
This interesting circuit found in a European publication from the 1990s eliminates the voice that...
This circuit also functions as a phase detector. The components used are not common. We found this...