As you can read on your schematic, R3 and R4 set amplitude, do the math and read the datasheet for more explanation. It is just like when you use the lm317 without the transistors.
As you can read on your schematic, R3 and R4 set amplitude, do the math and read the datasheet for more explanation. It is just like when you use the lm317 without the transistors.
This schematic is a programmable powersupply. By switching transistors you can get a "preset" voltage and use a microprocessor to control it.
Do you know something about electronics ? I do not think so. Come down to earth and tell us what you want to make.
A regulator that gives more voltages at the same time is not possible. You need 1 regulator for 1 voltage. So if you need 5 voltages, you need 5 regulators.
This schematic is a programmable powersupply. By switching transistors you can get a "preset" voltage and use a microprocessor to control it.
Do you know something about electronics ? I do not think so. Come down to earth and tell us what you want to make.
A regulator that gives more voltages at the same time is not possible. You need 1 regulator for 1 voltage. So if you need 5 voltages, you need 5 regulators.
ya ya that too i was arguing with people telling me but still they are on the same sentence , i still saying its not , logically no way out for such a process
sir actually i want to design a power supply which can provide voltage levels at diffrent output pints say a 3v 5v 9v 12v & so on & searching for a compact one but failed so making diffrent power supplies for diffrent levels with expansion in area
actually i was searching for a unit which can provide voltage levels at diffrent points but at same time so found this design & posted here for general idea so as to make my base about what i am doing for the aim , nothing else . .
but no way i got , i ll have to make diffrent regulated power units using lm317 as you said
OK, please be more specific, my crystal ball stays dark.
- how many outputs you need
- and what voltages you need.
- how much current per output
- do you need current limmiting or other protection like crowbars or OVP ?
- Powered from mains or DC-DC
- linear or switching ? (probably linear if you want the LM317
You need a transformer from mains to something like 15V , a big enough heatsinc, diode bridge, switch, busses, fuse, caps, resistors, extra diodes and some other small stuff, a 7815, 7812, 7809, 7805 and some 3V regulator. You can daisy chain the voltages if you do not use them all at once. Otherwise better use preregulation or powertransistors over the 78XX.
For instance a big enough transistor (18-9=9V x 0.5A = 4.5W dissipation, without that it would be: 18V-5V=13x0.5=-6.5W in that poor 7805.) and a 9V zener on the base followed by the 7805
OVP can be done by a VDR and a fuse, or a powerzener but with fixed voltage you do not use a settable OVP like in some lab bench supplys.