This circuit was found in the September 1997 issue of Electronics Now magazine. The circuit uses two op-amps and includes the symmetrical power supply.
To obtain a signal with a variable mark / space ratio in a ratio of 1 to 20 to 20 to 1, we have...
This traditional stable configuration with the TTL 7400 integrated circuit was obtained in a...
The circuits below were found in amarican publication of the year 1958. The transistors are...