| 摘要 |
<p>A wireless outdoor sound equipment consists of wireless sender and wireless receiver. The said wireless sender consists of volume control circuit, frequency generator, high frequency amplifier and band pass filter; the said wireless receiver includes import circuit, difference frequency amplifier, audio amplifier, solar battery and horn, the said solar battery provides power for circuit. Wireless electric connection mode is used between the wireless sender and wireless receiver, and the solar battery and accumulator are used in the receiver at the same time, the solar battery and accumulator provide stable working power supply to the wireless receiver without any line (powerline or sound line) enabling the sound outdoors to work reliablely, thereby bring great convenience to the use of user.</p> |
