Keywords: Sparktrans2.png Sparktrans2_vers_UK_vectorised svg A diagram of an experimental spark-gap radio transmitter This elementary circuit is quite different from those of practical spark transmitters which were used around the first decades of the 20th century The battery would need to have a potential of at least a thousand volts to cause a spark across the spark gap And the circuit has no switch or key for creating repeated sparks This circuit would create a single spark when the battery was attached then nothing w Image Sparktrans2 jpg 2005-12-21 wikipedia en user Cadmium en wikipedia Cadmium w Image Sparktrans2 jpg Spark-gap transmitter circuits |