Found in 1980s Electronic Engineering, this circuit uses common phototransistors as sensors. The circuit is CMOS using an integrated 4011.
This directed coupled amplifier uses a transformer to drive a low impedance loudspeaker. This...
This circuit uses two sensors that are placed at the intersection of a miniature railroad, causing the LED...
In the figure we present a circuit of a microphone signal conditioner using the SSM2167 integrated...