謝謝,又學(xué)一招:

500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖,點(diǎn)擊可放大。\n按住CTRL,滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/48/1165644525.jpg');}" onmousewheel="return imgzoom(this);">
這幾天沒上“網(wǎng)博”,讓LZ久等了.
我在T2上標(biāo)名了同名端(紅點(diǎn)):

500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖,點(diǎn)擊可放大。\n按住CTRL,滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/48/1165644681.jpg');}" onmousewheel="return imgzoom(this);">
T2更像是電流互感器:兩個(gè)主開關(guān)BJT的基極驅(qū)動(dòng)電流主要通過變壓器T2的正反饋提供.