Sir, i would like u to help me designing a linear regulated power supply. its specs are as such: 12V , 300mA. the ckt diagram. moreover, hw do i decide the ratings of MOV and fuse used in the protection ckt.
An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert who has answered 1,000 questions.
Re: Designing a linear regulated power supply
What you are doing is over **** for 300 mA, now if you will pulling some real wattage then you would need linear regulation.
just use a 10.00 ac adapter . or a zener diode .
the calculations in real time analysis is complex GE has the formula
online . but a spike at 300ma will be assorbed by the transformer
easilly. if you are protecting delicate circuit then a fuse will not
work quickly enough , fry and blow is all they do.
a crowbar circuit is what most designers use nowdays.fast and efficient.
There are plenty of IC regulators on the market that will give these
specs but I think your are over thinking your needs unless you have an
exact spec for medical research.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Assuming a car battery with a capacity of 70Ah at its nominal voltage of 12V, the total energy stored in it amounts to 12V * 70Ah = 940Wh.
Your Xantrex XPower 400 Inverter is designed to deliver continuous power of 320W at a specified efficiency of 90% (I doubt that, this degree may be achieved for ideal conditions of load / outside temperature / air humidity / current beer price, but not for the whole power range, but let it be 90% for the argument's sake).
Lets assume your desktop needs 150W of power (no high end CPU or graphics board involved), plus the 75W light bulb, plus 10% loss due to power conversion, gives a total of ~280W power need. This is well inside specs, so no problem here.
However, your battery can deliver this power for 940Wh / 280W = 3.8h only until its completely depleted.
Your observation of four hours of time from full charge to depletion is thus quite exactly what you can expect, you have no reason for complaints unless you were promised a longer time under the conditions you give.
The ATC-250U power supply is a 250W supply based on the combined wattage rating of each output adding up to 250W... so increasing one output current means another has to be reduced to remain a250W supply... newer computer power supplies are 400W, 600W and even 850W. The newer supplies regulate using the 3.3V supply as a sense. The ATC supply has no 3.3V. It uses the 5V supply for regulation which means the current must be a minimum or 3A, but is rated to a 25A maximum (125W). The 12V is rated up to 10A (120W) and the other 2 outputs make up the other 5W.
Hi! I saw your question, and maybe this will help. I also have a Texas Star 100w amp, and this same power supply. Even though the nominal draw for your equipment is way below the rated amp flow of the power supply, when you key up, and the output on the amp is at max, you are drawing the limit of your power supply! Try running this setup at a lower linear output. You don't need the full 100 watts to get out! 60-80 watts is aplenty! You should start at a low output, and slowly increase the output(while keyed up), untill the power supply starts to complain.(buzzer/light). This is what your limit will be. The only other cure, is a MUCH bigger power supply. Unfortunately, I cannot afford a 60-90 amp supply, so this is what I am forced to do to use the one we have. Also,keep your cb's output very low when using the linear amp. These amps are supposed to get a low signal from your radio, or the linear amp is overdriven. (noisy and unstable. Hope this helps you! 73's to you! jimsjinx
ATX Version 1.2 - 20 wire motherboard connector
The color scheme used for the voltages in the 20 pin connector holds for the other ATX standard power supply connectors. However, brand name manufacturers often build proprietary power supplies or make up their own color coding, so I wouldn't throw out a power supply that supplies 5V where you think it should supply 3.3V. It's more likely a proprietary design than a failure.