This circuit is from a 2004 documentation serving for signals from 1 MHz to 160 MHz. The antenna is of the telescopic type and the analog instrument is of the type found in old sound equipment.
Found in European documentation from the 1980s, this circuit was originally designed for computer...
This circuit, from a 303 Circuits from the 90s, uses a telephone pickup coil as a sensor to...
This circuit allows to increase the output power of a 741 as an amplifier. The circuit is from a...