This circuit was obtained in a 1964 Electronic Design. Equivalent modern transistors can be used. The circuit requires a 6 V symmetrical power supply.
This circuit was found in a 90s American documentation. The circuit uses still common components...
We found this configuration in a Radio Shack documentation from 1977. Here we have the way to...
This circuit was obtained from an American documentation from 1976. The circuit has a dynamic...