[問題] 產生方波
我需要產生從3000Hz到5000Hz的50%duty cycle的方波
必須要很精準，不能誤差超過10Hz
嘗試用555 IC來做，但是頻率對R1 R2 C1很敏感
想過用 SCHMITT TRIGGER 但是應該也是對電阻很敏感
有沒有建議使用的IC，有關於數位信號產生的
或是有更好的解法？
謝謝
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