Low Noise AC to DC Rectifier Using Capacitance Multiplier [Altium Designer]

[Hesambook]

According to tests, this circuit converts 1500mVp-p ripple to 10mVp-p. even can be better than this.

 

[betwixt]

But if you short the output you risk destroying the transistor as C4 discharges through its base-emitter junction.

Brian.

 

[Easy peasy]

also - the o/p is not exactly regulated

 

[Hesambook]

also - the o/p is not exactly regulated

The intention is not regulation, is the maximum noise reduction

 

[barry]

If your goal is simply what you are erroneously calling "noise reduction" could, without further requirements, simply be done with a resistor and cap.

 

[Hesambook]

If your goal is simply what you are erroneously calling "noise reduction" could, without further requirements, simply be done with a resistor and cap.

You use a resistor and cap in your circuit and draw one amp of your resistor and see what happens, how much noise is get reduced, Mr professional

 

[Easy peasy]

surely 100 / 120Hz ripple counts as noise ?

 

[barry]

You use a resistor and cap in your circuit and draw one amp of your resistor and see what happens, how much noise is get reduced, Mr professional

maybe next time you should state your requirements, Mr. amateur. Further, use a small resistor and a large capacitor and see what happens. Or an inductor rated for 1 Amp and a capacitor. Or, for that matter, a resistor rated for the proper wattage.

And,no, easypeasy, i don’t think ripple is noise. Noise generally refers to RANDOM fluctuations, and generally not a single frequency.

 

[FvM]

The exact technical term is "noise and interferences". It's legitimate language criticism to question the thread title. I presume everyone knows though what the thread is talking about. I also take it as granted that in English technical literature "noise" is often used in a wider sense, e.g. "switching noise".

Regarding advantage or disadvantage of the discussed circuit, I agree that passive RC and LC power supply filters are preferable in some applications but not in all.