Simple AC to DC converter

276

04:59:51

220V\50Hz to 15V

published 7 years ago

sshsslfun

7 years ago

220VAC is 311Vpeak, not 220. Also, you might want to place down a zener and an inductor to make it more stable.

Serge

7 years ago

ok))

kiani

7 years ago

Zeners can sink max. Of 20mA or so before they burn out, yiu are sinking 100mA.. ( just measure the current through it.). When yiu desigh power supply it is best to work bakwards, ie. From output towards input. Then everything gets considered.

sshsslfun

7 years ago

@kiani Who told you only 20mA zeners exist? Theres zeners for 15V and 1.5W(100mA) and they dont cost 10 cents

kiani

7 years ago

Never used zeners more than 20mA. But look at the efficiency... 80 mA in yhe load, and 100mA in the zener alone. So the PSU is arround 10 to 20

kiani

7 years ago

% efficient.

hurz

7 years ago

Its not the current what limits zener in operation its the power. If @kiani is talking about 20mA he.probably mean the everycircuit zener settings for e.g 15V and 20mA which is 300mW. This is a standard little discret zener. It can also be 3V and 100mA or 30V 10mA. But the product must be around 300mW. This for the default resistive and saturation settings.

BillyT

7 years ago

There are many different ways to make a simple power supply, see, http://everycircuit.com/circuit/4911934096015360

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