We found this measurement circuit with a logarithmic scale in an Electronics Now from November 1995. The circuit uses an integrated component from that time.
An OR gate can be improvised using NAND gates of a 4001 as shown here. The diodes are...
We found this circuit in a Popular Electronics of the 90s. The circuit still uses light bulbs, but...
This low input impedance amplifier stage was found in a 1963 documentation. The circuit employs a...