We found this CMOS circuit for excitation of a relay in an old documentation. The transistor is a general-purpose high voltage as used in the power supply.
The TAA300 integrated circuit is not common today. In fact, the circuit shown is from a Dutch...
Found in documentation two years 80, this toy instrument uses an integrated circuit little...
In the figure we have the way to connect an LED on the output of a power source to indicate the...