This circuit, found in a 1958 magazine, is for reference only, since the components are not easy to find today. The transistors are germanium types and power supply is made by common cells.
In the figure we have a converter that generates a negative voltage from a positive voltage...
We found this circuit in an old optoelectronics manual from Texas Instruments. However, more...
The integrated circuit used in this project is not the most common. The use of a crystal...