We found this light relay circuit in year 2000 documentation. The relay is 6 V and the circuit includes a power supply. It can be used to control various devices from the incident light in the LDR.
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...