Found in documentation from the 1980s, this circuit can generate signals between 6 and 8 MHz. The frequency can be slightly varied in the setting. FET is a general-purpose type.
This interesting circuit was found in a 1967 Japanese documentation. Transistors are types of...
This assembly circuit using a small motor as a generator was found in Radio Electroics magazine from...
This circuit is of great use today, when solar energy is becoming increasingly important. The...