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link 18.12.2007 18:57 |
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Subject: 91 OK / 20K 91 OK / 20K - ?The example circuit uses the UC3854 so the maximum value of Vff is 4.5 volts. If Rff1, the top resistor of the divider, is 91 OK and Rff2, the middle resistor, is 91 К and Rff3, the bottom resistor, is 20K the maximum value of Vff will be 4.76 volts when the input voltage is 270Vac RMS and the DC average value will be 243 volts заранее спасибо |
| верхний резистор делителя имеет сопротивление 910 кОм, средний 91 кОм, нижний 20 кОм |
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