This old two-stage video amplifier uses integrated circuits that are not easily obtainable today. The circuit is for analog video and was found in an American 1980s documentation.
This circuit generates two signals in phase opposition. The frequency is determined by R1 and C1...
This one-digit photometer using CMOS circuits was found in a 1989 documentation. The circuit is...
A NOR gate can be improvised using one NAND gate of a 4011 as shown here. The diodes are...