This small tube amplifier appeared in Radio Electronics magazine in February 1958. The circuit is powered by the mains with a power transformer and output with different impedances.
This two-transistor emitter-coupled oscillator circuit with capacitive feedback was found in the...
This simple circuit produces sound effects given by the 4093 oscillators and switches LEDs...
This circuit uses two sensors that are placed at the intersection of a miniature railroad, causing the LED...