| 摘要 |
In an arrangement for generating sound signals using compressed air, use can be made of an electric, chargeable battery 2 as an energy source, by generating the compressed air directly using a compressor of great capacity driven by an electric motor. Control of the signals takes place by a relay-controlled solenoid valve 11 in a compressed-air line 7 between the compressor 6 and a sound generator 8, while control of the motor compressor unit 5, 6 takes place using a relay 4 which is in turn controlled by a delay arrangement 9 which keeps the compressor in operation for roughly a second after a stop signal. <IMAGE> |
