This circuit is from an American 80's documentation. The transistor is general purpose, functioning as a zener. The circuit is used with a 9 V battery starting to flash when the voltage drops below 7.6 to 6.5 V.
This circuit is from an American 80's documentation. The transistor is general purpose, functioning as a zener. The circuit is used with a 9 V battery starting to flash when the voltage drops below 7.6 to 6.5 V.