This configuration similar to many of this site was found in 1965 General Electric documentation. Modern equivalent transistors can be used. LEDs can be used.
This low distortion circuit was found in a 1964 Electronic Design. The transistor admits...
In the figure we have the basic configuration for interfacing TTL logic with CMOS logic. The...
This switch is triggered by the touch of the sensors, which can be two metal plates. These plates...