We found this circuit in a Popular Electronics of the 90s. The circuit can be easily mounted today, as the components are common. The SCR can be the TIC106.
Found in American documentation from the 90s, this circuit converts 28 V to 155 V with a frequency of...
This simple game in which the player has to guess the chosen position of the key was found in a...
We found this transistorized timer in a 1985 documentation, but it is still up to date by the...