This is an amplifier circuit intended for modulating transmitters. The 5-tube circuit is from an American manual from 1947. The power supply uses a transformer.
This circuit was found in a 90s Electronic Design. It uses integrated circuits that are not common...
This simple game in which the player has to guess the chosen position of the key was found in a...
Found in a Hands-On Electornics, this touch biestable can control loads that depend on the SCR....