This circuit was found in an American documentation from the 90's. The transistor is a general purpose one. The circuit oscillates well between 12 and 30 MHz with the indicated components.
This circuit was found in a 1970s General Electric documentation. Transistors are uncommon today....
When the lights turns off this circuit will produce a sound like a cricket. When the lights are...
Found in National Semiconductor documentation this circuit converts a rectangular signal into an...