This simple Morse Code oscillator was found in a 1980s American documentation. The power supply should be powered with 5V and the integrated can be the 7400.
Found in American documentation from the 1980s, this circuit for general purpose transistors has good...
Some old record players use variable reluctance phono pickups, requiring a special amplifier...
This automatic dimmer for incandescent lamps was found in a European publication from the 1980s. The...