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| dual usb charger | |
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| 555 Calculator (v1.1) |
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| T1 (on-time) = 0.693 * (R1 + R2) * C1 T2 (off-time) = 0.693 * R2 * C1 T = 0.693*( (R1 + 2R2) * C1 ) F = 1/ T = 1.44 / ( (R1 + 2R2) * C1 ) D = (T1 /(T1+T2))*100 |
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Note : 1) To calculate T1 and T2 given R1, R2 and C1. 2) To calculate R1 given T1, C1 and R2 only.Do not insert T2 3) To calculate R2 given T1, T2 and C1 only.Do not insert R1 4) To calculate C1 given T1, T2 and R2 only.Do not insert R1 5) some values can not generate output in the practice. |
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