This circuit makes use of a mechanical delay line to produce the reverberation effect. This is a '80s setup, showing both channels for a stereo system.
This circuit is from a 1969 Electronics World. The transistors may be modern general-purpose...
This circuit was obtained from Radio Electronics from the 90s. The infrared sensor is of an...
This control panel allows the use of NO and NC sensors, turning the alarm on after 30 seconds...