When the power is cut off, this circuit keeps the flashlight on for a while, allowing it to be located. The circuit is from a Radio Electronics from September 1992.
This circuit for audio applications was found in an English magazine from the 80's. The circuit...
This circuit uses two transistors, the low noise BC549. Its quality is very good and it has a...
This differential amplifier, found in a 1964 Electronic Design, has a gain of 30. The setting can be...