This circuit was found in an American documentation from the 90's. The transistor is a general purpose one. The circuit oscillates well between 12 and 30 MHz with the indicated components.
This circuit was found in an old Electronic Design used to apply digital signals to an analog...
This circuit is based on an operational window comparator. We found it in a documentation from the...
This circuit is recommended for alarm systems since it has a good output stage. The circuit is...