Datasheet of This battery powered intercom was found on a January 1947 Radio Craft. |The circuit is 4-way but can be modified by changing the key.
This is a project from a 1987 publication. The circuit tests transistors without removing them...
This MW radio circuit with varicap tuning was found in an English documentation from 1989. The...
This circuit uses an infrared remote-control sensor found on televisions. The circuit can control...
