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Fight
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Posts posted by Fight
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There's no hard and fast rule, I just use current balancing resistors which have a voltage drop of a couple of hundred mV or so at full current. The voltage drop can be calaculated using Ohm's law.
okQuote
if this method using with lm317 and lm338 than thses ic better current and voltage or not
?
my mean that if using transistor current increasing method for lm317 or lm338 regulator ic than this method ok or not because volatge vary from 1.2 to 30 v
7805 or 7812 is fixed regulator -
what is the efficiency of these circuit
if this method using with lm317 and lm338 than thses ic better current and voltage or not -
it's just that if the voltage drop across the resistors is very low, the current sharing won't be very good.
please explain it using examples
if 10R resistor use than -
if i change the value of 1R instead of 0.1R than what change in circuit current
the resistor wattage
the voltage across R = ?
the current across R = ? -
Attatch diagram
what is the role of emittr resistance 0.1 ohm
why using this resistor
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I Attatch Diagram
if i use digital pot by replacing R2 that ok or not
and if digital pot using in variable power supply by changing voltage and current than ok or not
please send digital pot ic nos that available in market
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solid state relay can hadle high voltage and current
any other method using SCR and other method control as switch -
if i use cd4066
1. this ic Open or close the resistor like other sitches (mean short and maximum current flowing)
2. if short than max current handle
3. if short than max Voltage handle = 15V or greater if i use 5V supply for ic than switch 15V can handle or not -
i try to buy a digital pot but not meet digital pot
NO
DS1803
AD7376
if meet the digital pot in market than this lower position only 64 position digital pot -
Because digital pot is not available in this country
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i trying a fixed resistor to variable resistor using no of fixed resistor and control using switches
these resistor 1,2,4,8,16 in steps
mean using fixed resistor control digital mode -
i design a smps power supply 0-30V any body help me with diagram and other information
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if own design a saimple solid state relay please send any diagram
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Thats good answer
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Very Very Thanks Hero
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Hello to all
i attatch diagram the resistor short or open thru switches these switches can handle thru relay
i want these switch are electronic switches how control thru BJT or other switching device
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The LM338 will only be able to output 5A if the difference between the input and output voltage is under 10V and a good heat sink is used (1
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In lm338 data sheet asking
Features:
Guaranteed 7A peak output current
Guaranteed 5A output current
But problem is that in Electrical Characteristics:
Vin-Vout = 30V Than max current 1A
what is meaning that
lets Vin = 38V and Vout = 8V
38-8 = 30
and Vin-Vout = 10V or less than 5A can handle
mean
38-28 = 10
mean 8 to 28V 1A handle
and 28 to above 5A handle
Attatch Diagram
2. in Application Hints diagram all diagram is designed that can handle 5A
Attatch Diagram
LM338 Power Suply Current Regulator
in Datasheet/Parts requests
Posted
Attatch diagram
first circuit is use for current limiting
transiter is use for current increasing transistor current provide 5A at all voltage range 1.2-30V
this circuit is good
better
best
or not