This low-noise, low-drift amplifier was found in a 90's EDN. It can be implemented with modern equivalent operational amplifiers. The font must be symmetrical.
This twisted pair exciter circuit uses 80's components. The circuit is from a documentation of the time, but...
This oscillator produces a signal with a central frequency in 1 MHz. This frequency can be...
This circuit was found in a 1980s documentation for amateur radio. The circuit makes use of...