The circuit described is one more addition to the variety of warning signals intended mainly for use in cars. It causes a warning signal to sound when the turn indicator control has not returned to its neutral state. The circuit ` is particularly effective for those cars in which the turn indication is not accompanied by a clearly audible click. Further, the circuit sounds a warning signal when· the ignition switch is `off` while the headlights are still `on`. The circuit is designed for 12 volt negative earth systems.
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