This circuit controls 6 LEDs in two sets with the phase change cycles controlled by a 555 oscillator. The circuit can be powered by voltages between 6 and 12 V.
This high voltage source for gas LASER was found in documentation from the 1990s. The circuit is...
Equivalent comparators can be used on this AND gate. We found it in a Popular Electronics from the 90s. Power...
A NOR gate can be improvised using one NAND gate of a 4011 as shown here. The diodes are...