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This circuit has a voltage output of about 12 volts with 20mA current voltage. And this series of works using capacitive reactance and resistance are not using, this will reduce the heat on the circuit. To be safe when there is a short-circuit series, always use a fuse on the input voltage is 220V. Here is a series of power supply without a simple transfomer. Power supply Circuit Part List R1 - 1.8K 1W R2 - 100Ω C1 - 0.47µF 400V C2 - 1000µF 50V D1 - 1N4007 D2 - 1N4007 D3 - 1N4007 D4 - 1N4007 ZD1 - 16V Zener Diode ZD2 - 16V Zener Diode ZD3 - 12V Zener Diode

This is a electronic HQ Notch Filter Without Close-Tolerance Components Project . A notch for a narrow frequency band of a few per cent or even less normally requires close-tolerance components. At least, that’s what we thought until we came across a special opamp IC from Maxim. In filters with steep slopes, the component tolerances will interact in the complex frequency response. This effect rules out the use of standard tolerance components if any useful result is to be achieved. The circuit shown here relocates the issue of the value-sensitive resistors that determine the filter response from ‘visible’ resistors to ready available integrated circuits which also make the PCB layout for the filter much simpler. The operational amplifiers we’ve in mind contain laser-trimmed resistors that maintain their nominal value within 1‰ or less. For the same accuracy, the effort that goes into matching individual precision resistors would be far more costly and time consuming. The desired notch (...