This circuit is based on a Siemens S566B integrated circuit. The circuit is from a Radio Electronics Experimenter and also has a digital control input.
This circuit uses two sensors that are placed at the intersection of a miniature railroad, causing the LED...
Many oscilloscopes have high impedance inputs that make it difficult to observe high frequency signals...
This wired intercom circuit was found in a March 1965 Radio Electronics. The circuit uses two...