Found in a 90s PE Hobbyst Handbook, this circuit mimics the sound of a space gun. The components are common, and changes can be made to modify the sounds.
We found this circuit in a 1980s American documentation. The operational amplifiers of the...
This input circuit for an oscilloscope was found in Radio Electronics from the 90s. The operating...
This circuit emits a sound when a magnetic field, of a magnet, for example, approaches the sensor....