This circuit was obtained in a 1964 Electronic Design. Equivalent modern transistors can be used. The circuit requires a 6 V symmetrical power supply.
We found this circuit in an English publication from 1963. The circuit uses germanium transistors of the...
This circuit that imitates the sound of the cowboys' calls with their “louder” was found in a...
This circuit was obtained from Linear Technology documentation from the 90's. The circuit uses...