This circuit was found in a Modern Transistor Workbook from 1965. The circuit sends signals from a small record player to a medium-wave radio placed nearby.
This is one of many timer settings with the 555 found on this site. This is the traditional...
This 3-transistor circuit was found in a Mullard manual from 1960. The transistors are germanium of the...
Found on 80's Popular Electronics, this circuit uses an uncommon integrated today. Programming is done...