Because he has a boss like my old boss who thinks it's always cheaper to do it in house so he just dumps it onto some poor schlub and says "Make it so!"I have to ask what you think you need a 1,000 Watt 0V-200V variable power supply for? That's mighty ambitious for your 1st post.
The pot on the back of the Variac sets the DC voltage of the output regulator at about 3 volts below the peak charge on the filter capacitors.What does the pot do?
Ok, mine are all basic Variac's, AC in AC out.The pot on the back of the Variac sets the DC voltage of the output regulator at about 3 volts below the peak charge on the filter capacitors.
As #12 noted the pot controls the regulator. This means the output is regulated against line and load changes, unlike just a Variac rectifier-capacitor output. Also the regulator adds a great deal of ripple filtering so you don't need such a big filter capacitor for a given level of ripple, and the output ripple doesn't vary significantly with load.Ok, mine are all basic Variac's, AC in AC out.
Max.
I took it to mean an actual power supply which has regulated voltage and/or regulated current, not a variac.I am in need of designing a 200V 5A power supply with variable voltage (0-200V) and Variable current (0-5A).
That's one way, but Max brought up the Variac design. The output is just as good, as far as being a clean, adjustable, regulated DC voltage, but you don't need 1000 watts worth of output transistors. You can use an isolation transformer to comply with the terms of service at this site and to get your highest voltage correct.I took it to mean an actual power supply which has regulated voltage and/or regulated current, not a variac.
A variac output is not regulated. As the load current increases and decreases, the voltage will change due to loading effects. It may be "good enough" for some applications, but it is not a regulated power supply.That's one way, but Max brought up the Variac design. The output is just as good, as far as being a clean, adjustable, regulated DC voltage,
A basic Variac, at least the ones I have, are all variable transformers, no rectification or other control?, unlike just a Variac rectifier-capacitor output. .
by Jake Hertz
by Duane Benson
by Jake Hertz