Transformerless power supply, up to 30 milliamps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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To power devices with a consumption current of up to 30 mA, simple network power supplies can be used, in which two capacitors for an operating voltage of at least 300 V are used instead of step-down transformers. Resistor R1 is used to discharge the capacitors after the unit is turned off from the network.
The parameters of such blocks with different capacities C1 and C2 and diodes VD3 and VD4 are shown in the table.
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