Suggested by a 90’s Radio Electronics, this circuit automatically activates the recording switch of an old tape recorder. It can be adapted for other purposes.
This circuit was obtained from the component's datasheet, a comparator with voltage reference for...
The circuit shown in the figure is from a time base that generates 60 Hz rectangular signals. |...
This circuit from an old American publication uses a 12 V transformer and an incandescent lamp in an...