This elaborate mixer is from an Electronics Today International from the 80s. Operational amplifiers are common and resistors with no value determine the gain of the amplification steps.
This circuit was obtained from a 1967 GE SCR manual. It is intended for controlling relays...
Microchip's EQCO62X20 6.25Gbps Asymmetric Coax Equalizer is a driver/equalizer chipset that forms...
This circuit was found in the August 1992 issue of Radio Electronics magazine. The circuit can be...