This power source for Gas Laser was obtained in a 90’s Electronic Design. The circuit uses a switched regulator from the time. Equivalents can be used.
This well-known configuration, used in many car radios, is from the Philips Data Book of 1990. The...
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
In this circuit of 1987 the player has to briefly press one of the keys trying to hit which LED...