This circuit was found in a 1964 Electronic Design. The circuit makes use of transistors of the time. Current equivalent transistors may be experienced.
This circuit was obtained from an old American documentation, and practically any general-purpose transistor...
This light relay is powered directly by the power grid by activating a 110 V relay. The LDR is of...
We found this amplifier in a publication of 1990, but it can be mounted today with some exchanged...