In the figure we have a good rectangular signals generator with several frequency bands. The circuit is based on old logic but can be implemented with modern equivalents.
This circuit is from a 1980s Motorola documentation. The circuit can be set to fire from 60 to 120...
This amplifier was found in an old publication of 1990. With the changes, it may still be...
In the figure we have a very low current DC to DC converter using a 555. The circuit can have...