555定时器构成的多谐振荡器周期计算公式的单位是什么？ 555多谐振荡电路的周期计算公式是多少
555\u5b9a\u65f6\u5668\u6784\u6210\u7684\u591a\u8c10\u632f\u8361\u5668\u5468\u671f\u8ba1\u7b97\u516c\u5f0f\u7684\u5355\u4f4d\u662f\u4ec0\u4e48\uff1f\u5982\u56fe\u6240\u793a\uff0c\u6539\u53d8c1\u7684\u503c\u53ef\u4ee5\u6539\u53d8\u5468\u671f\u3002\u8c03\u8282rp\u53ef\u4ee5\u6539\u53d8\u5360\u7a7a\u6bd4\uff0c\u4e5f\u53ef\u4ee5\u628ar1\u6216\u8005r2\u6362\u6210\u4e00\u4e2a\u53ef\u53d8\u7535\u963b\uff0c\u7528\u6765\u8c03\u8282\u5468\u671f\u3002
\u8865\u5145\uff0c\u591a\u8c10\u632f\u8361\u5668\u7684\u5de5\u4f5c\u539f\u7406\u53ca\u7ec6\u8282\u3002
1\u3001\u5468\u671f\u8ba1\u7b97\u516c\u5f0f\uff1af = 1 / T = 1.44 / (R1 + 2R2)*C\u3002
2\u3001\u542b\u4e49\uff1af\u4e3a\u9891\u7387\u3001T\u4e3a\u5468\u671f\u3001R1,R2\u4e3a\u7535\u963b\u5927\u5c0f\u3001C\u4e3a\u7535\u5bb9\u5bb9\u91cf\u5927\u5c0f\u3002
\u6269\u5c55\u8d44\u6599\uff1a
\u4e00\u3001\u5f15\u811a\uff1a
1\u30011\u811a:\u5916\u63a5\u7535\u6e90\u8d1f\u7aefVSS\u6216\u63a5\u5730\uff0c\u4e00-\u822c\u60c5\u51b5\u4e0b\u63a5\u5730\u3002
2\u30018\u811a:\u5916\u63a5\u7535\u6e90VCC,\u53cc\u6781\u578b\u65f6\u57fa\u7535\u8defVCC\u7684\u8303\u56f4\u662f4.5 ~ 16V\uff0cCMOS\u578b\u65f6\u57fa\u7535\u8defVCC\u7684\u8303\u56f4\u4e3a3~ 18V\u3002\u4e00\u822c\u75285V\u3002
3\u30013\u811a:\u8f93\u51fa\u7aefVo\u3002
4\u30012\u811a:\u4f4e\u89e6\u53d1\u7aef\u3002
5\u30016\u811a: TH\u9ad8\u89e6\u53d1\u7aef\u3002
6\u30014\u811a:\u662f\u76f4\u63a5\u6e05\u96f6\u7aef\u3002\u5f53\u6b64\u7aef\u63a5\u4f4e\u7535\u5e73\uff0c\u5219\u65f6\u57fa\u7535\u8def\u4e0d\u5de5\u4f5c\uff0c\u6b64\u65f6\u4e0d\u8bbaTR\u3001TH\u5904\u4e8e\u4f55\u7535\u5e73\uff0c\u65f6\u57fa\u7535\u8def\u8f93\u51fa\u4e3a\u201c0\u201d,\u8be5\u7aef\u4e0d\u7528\u65f6\u5e94:\u63a5\u9ad8\u7535\u5e73\u3002
7\u30015\u811a: VC\u4e3a\u63a7\u5236\u7535\u538b\u7aef\u3002\u82e5\u6b64\u7aef\u5916\u63a5\u7535\u538b\uff0c\u5219\u53ef\u6539\u53d8\u5185\u90e8\u4e24\u4e2a\u6bd4\u8f83\u5668\u7684\u57fa\u51c6\u7535\u538b\uff0c\u5f53\u8be5\u7aef\u4e0d\u7528\u65f6\uff0c\u5e94\u5c06\u8be5\u7aef\u4e32\u5165\u4e00\u53ea0.01uF\u7535\u5bb9\u3002
\u4e8c\u3001\u82e5\u89e6\u53d1\u8f93\u5165\u7aefTR\u7684\u7535\u538b,\u5c0f\u4e8eVCC /3\uff0c\u5219\u6bd4\u8f83\u5668C2\u7684\u8f93\u51fa\u4e3a0\uff0c\u53ef\u4f7fRS\u89e6\u53d1\u5668\u7f6e1,\u4f7f\u8f93\u51fa\u7aefOUT=1\u3002\u5982\u679c\u9608\u503c\u8f93\u5165\u7aefTH\u7684\u7535\u538b\u5927\u4e8e2VCC/3\uff0c\u540c\u65f6TR\u7aef\u7684\u7535\u538b\u5927\u4e8eVCC/3\uff0c\u5219C1\u7684\u8f93\u51fa\u4e3a0\uff0cC2\u7684\u8f93\u51fa\u4e3a1,\u53ef\u5c06RS\u89e6\u53d1\u5668\u7f6e0\uff0c\u4f7f\u8f93\u51fa\u4e3a0\u7535\u5e73\u3002
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1-\u591a\u8c10\u632f\u8361\u5668
\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1-\u8c10\u632f\u7535\u8def
555振荡频率由外接的RC时间常数确定，理论上f =0.7/RC。
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绛旓細璇555澶氳皭鎸崱鍣杈撳嚭姝ｈ剦瀹戒笌璐熻剦瀹界浉绛変负 t1=t2=0.693r1c=0.693脳20脳10^3脳2000脳10^(-12)绉=2.773脳10^(-5)绉 鎸崱鍛ㄦ湡鍙婇鐜 t=t1+t2=2脳2.773脳10^(-5)绉=5.545脳10^(-5)绉 f=1/t=18.03khz rd绔瓙鎺ヤ綆鐢靛钩鏃跺仠鎸
绛旓細涓婇潰鏄垜绌洪棿鐩稿唽閲岀殑 555 瀹氭椂鍣鐢佃矾銆傚懆鏈熸槸 锛氾紙 R1 + 2 * R2 锛* C * ln2鍗犵┖姣旓細 锛圧1 + R2 锛/锛圧1 + 2 * R2 锛夌煩褰㈡尝銆
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绛旓細褰 R2=6.9k鏃讹紝f=1/[0.69C(R1+2R2)]=1kHz銆
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