Found in a PE Hobbyst Handbook, this circuit checks if there is voltage in a power outlet by emitting sound and lighting an LED.
This is the power supply for the amplifier shown in CB18507E. Power transistors must be mounted on heat...
This oscillator was found in a Raytheon documentation from the 60's. The phone must be high...
This window comparator configuration is from a 1980 publication. It is a conventional circuit that...