This interesting circuit for analog TV selects the first line of a frame. The circuit was found in a 1967 Electronic Design. A modern equivalent transistor can be tried.
We found this circuit in an American publication from the 80's translated into Portuguese. The...
This circuit generates a tone of a bell and can be used in this type of application. The circuit is...
This amplifier is from the 1982 SGS linear integrated circuit manual. The power supply must be...