This electronic roulette circuit with 10 numbers was found in a Popular Electronics from the 80s. The circuit uses indicator LEDs and the transistors are general purpose.
This is one of the possible configurations using the LM139, 239 or 339 voltage comparators. The...
Have you not yet memorized the color code used to identify resistors and capacitors? Do you have...
Found in American documentation from the 90's, this circuit consists of a solid state relay with...