I've created a darligton pair circuit to amplify +/- 10mA to +/- 10 A . Nonetheless it displaying only postive swing. I would like negative swing far too. what must i do （使）演奏;（使）播放 Play the last few minutes from the video once again. 把录像带的最后几分钟再放一遍。 I read most of them utilised https://bowling-boom-game-online79852.blogzet.com/the-best-side-of-bowling-boom-game-multiplayer-51348872