This circuit was found in a 1967 RCA publication. The circuit uses components from that time, and can be used with loads up to 240 W.
This circuit from a Popular Electronics from the 90s allows you to use an old PC as a digital...
We found this circuit in Radio Electronics magazine from June 1960. The four-transistor circuit is...
This type of answering machine was common at the time this circuit was published. Using two tape...