This 1 to 40 MHz amplifier is from a 1969 Motorola documentation. The components are of the time but admit modern equivalents.
This circuit is from an American magazine that no longer exists, Modern Electronics, in a February...
Found in a 90s Popular Electronics, this circuit aims to find the voltage of a zener diode up to...
Found in a Popular Electronics from the 90s, this circuit is suitable for testing and tuning...