This 1 to 40 MHz amplifier is from a 1969 Motorola documentation. The components are of the time but admit modern equivalents.
Found in American documentation, this circuit from the 90s uses components from that time. The...
This circuit was found in a 1980s documentation. The operational amplifier is of a common type at the...
This simple audio and RF signal tracker was found in a Japanese publication in 1967. The...