In the figure we have a simple 5 V power supply obtained from an American documentation from the 90's. The integrated circuit must be equipped with a heat radiator.
The circuits below were found in amarican publication of the year 1958. The transistors are...
With this circuit it is possible to use a control voltage to select audio signals that pass...
This PLL with operational amplifiers was found in 1969 documentation. The configuration can be...