We found this circuit in a 1966 documentation. The circuit is intended for a door opening system by the headlight of a car. The sensor is a photo-FET, an uncommon component today.
The circuit shown is only for analog telephone lines. I found it in Popular Electronics (1991). It...
We found this amplifier in the Philips Databook of 1990. The stereo circuit has power that reaches 6...
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...