This circuit is from a Radio Electronics magazine from August 1990. The circuit uses components from the time and is suitable for measurements in alternating current.
This circuit appears in similar versions on this site. This is from a Popular Electronics from the 80's. The...
This circuit for light data transmission (visible or IR) has a maximum speed of 1 Mbps and can be...
Using a varactor or varicap, this 1969 Electronics World circuit has a modulation range from 75...