i want to design it by my self, not buy ready solutionRemember when we used dial up modems?
Recently I bought some very small name-brand mains input to 5VDC/2A adapters for them at a surplus electronics store for only $1.75 each. They are too small and lightweight to have a mains transformer inside. They probably rectify and filter the mains then use a high frequency oscillator and a small ferrite-core transformer that has its output rectified and filtered then it uses feedback for voltage regulation.
Where will you find the special parts?i want to design it by my self, not buy ready solution
Hi,
Take a resistor, a zdiode, a high voltage transistor (BUK..) and a capacitor..
can you please help with schematic ?Sorry, not BUK, but BUL or BUJ,
I used BUL1102E (450V), and BUJ302A (1050V).
Klaus
Edit1: spelling
can you please help with schematic ?
thanks,
i dont need high precision, why i need pre-regulator ?For high precison, you'll use a discrete (z-diode + transistor) pre-regulator and a standard 5V-IC regulator.
I probably misunderstood your previous post. Anyhow, the z-diode used in a discrete regulator will involve about +/- 0.3 V initial tolerance, temperature and load effects in addition.i dont need high precision, why i need pre-regulator ?
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