This circuit is from an American 80's documentation. The circuit indicates when the voltage of a 9 V battery drops below 7 V. The transistors can be BC548.
This common 555 circuit was found in documentation from the 90s. The circuit uses two 555s and the...
This type of circuit, found in American documentation from the 1980s, triggers producing output...
This circuit is nothing more than a voltage quadruplicator that can generate close to 1 000 V from...