**need help with AC to DC and DC to DC power supply TT** - Electronic Circuits Projects Diagrams Free

ahdehling · 16th May 2007, 10:16 AM

first of all, i think i shall intro myself! hi all, im Adeline

nice to meet you all

im a newbie in engineering and im in a project of making a DIY 2.1 speaker, and im in charge of the all powerful power supply

ok back to project *dies* i will try to give as much details as i can so help a poor newbie please ><

like i say, i need to design a power supply for a 2.1 speaker. I need a AC to DC and DC to DC circuit

AC to DC
Input Voltage: 230-240Vac
Output Voltage: 14.2Vdc
Power needed: 50W
Current: 3.5A

transformer > full wave recitifer > shunt regulator[a resistor + zener diode] > output [more or less what i plan to use for the circuit]

I dont know what else is needed..but i need to design the circuit, with what is needed, and the value of each parts [like the value of resistor and etc].

DC to DC
Input Voltage: 18.5Vdc
Output Voltage: 14.2Vdc
Power and Current: 50w and 3.5A

Im thinking of using a buck converter IC but Im unsure of how the ic works.. and what else is needed..

please try to help me as much as possible >< [and fast too TT]

thanks all for reading

Optikon · 16th May 2007, 01:42 PM

Quote:

Originally Posted by ahdehling

first of all, i think i shall intro myself! hi all, im Adeline

nice to meet you all

im a newbie in engineering and im in a project of making a DIY 2.1 speaker, and im in charge of the all powerful power supply

ok back to project *dies* i will try to give as much details as i can so help a poor newbie please ><

like i say, i need to design a power supply for a 2.1 speaker. I need a AC to DC and DC to DC circuit

AC to DC
Input Voltage: 230-240Vac
Output Voltage: 14.2Vdc
Power needed: 50W
Current: 3.5A

transformer > full wave recitifer > shunt regulator[a resistor + zener diode] > output [more or less what i plan to use for the circuit]

I dont know what else is needed..but i need to design the circuit, with what is needed, and the value of each parts [like the value of resistor and etc].

DC to DC
Input Voltage: 18.5Vdc
Output Voltage: 14.2Vdc
Power and Current: 50w and 3.5A

Im thinking of using a buck converter IC but Im unsure of how the ic works.. and what else is needed..

please try to help me as much as possible >< [and fast too TT]

thanks all for reading

On the AC-DC, using a resistor and shunt zener regulator and expect to deliver 50W, 3.5A? You might want to re-think that part of the design.

Consider instead an LM317, several outboard pass transistors (~1A each) and a large heatsink to bolt everything onto.

Blatman Bond · 1st June 2007, 01:44 PM

OK!. Hello adeline, nice to meet you.

Let's start with AC to DC.
It's nothing with transformer and rectifier. But you'll need any power transistor with attached heatsink to dissipate power.
Sorry with the value, please design it 1st. So I can help.

Now, buck converter.
All that you need is read any buck converter articles, you may ask me which part you don't understand. Typically they collect current from input voltage to inductor and convert it back to output voltage. Charge and discharge. You need to know about Inductor 1st, where V(L)=L*dI(L)/dt.

Hero999 · 1st June 2007, 11:18 PM

http://www.maplin.co.uk/Search.aspx?...=XM22Y&DOY=1m6

5A 13.8V DC PSU XM22Y £19.99

k7elp60 · 1st June 2007, 11:35 PM

Both power supplys could use an LM338 as a regulator as it will safely handle
5A.

Thunderchild · 25th June 2007, 09:40 PM

do you actually need a regulated power supply ? most power amps can run on a simple full wave rectifier followed by a smoothing condenser (that you forgot to mention and is essential),

if you want to smoth it a bit more without too much complication use a LC filter but I'm not an expert in those

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16th May 2007, 10:16 AM	(permalink)
ahdehling	need help with AC to DC and DC to DC power supply TT first of all, i think i shall intro myself! hi all, im Adeline nice to meet you all im a newbie in engineering and im in a project of making a DIY 2.1 speaker, and im in charge of the all powerful power supply ok back to project dies i will try to give as much details as i can so help a poor newbie please >< like i say, i need to design a power supply for a 2.1 speaker. I need a AC to DC and DC to DC circuit AC to DC Input Voltage: 230-240Vac Output Voltage: 14.2Vdc Power needed: 50W Current: 3.5A transformer > full wave recitifer > shunt regulator[a resistor + zener diode] > output [more or less what i plan to use for the circuit] I dont know what else is needed..but i need to design the circuit, with what is needed, and the value of each parts [like the value of resistor and etc]. DC to DC Input Voltage: 18.5Vdc Output Voltage: 14.2Vdc Power and Current: 50w and 3.5A Im thinking of using a buck converter IC but Im unsure of how the ic works.. and what else is needed.. please try to help me as much as possible >< [and fast too TT] thanks all for reading

1st June 2007, 01:44 PM	(permalink)
Blatman Bond	Im new here, new members. OK!. Hello adeline, nice to meet you. Let's start with AC to DC. It's nothing with transformer and rectifier. But you'll need any power transistor with attached heatsink to dissipate power. Sorry with the value, please design it 1st. So I can help. Now, buck converter. All that you need is read any buck converter articles, you may ask me which part you don't understand. Typically they collect current from input voltage to inductor and convert it back to output voltage. Charge and discharge. You need to know about Inductor 1st, where V(L)=L*dI(L)/dt.

1st June 2007, 11:18 PM	(permalink)
Hero999	http://www.maplin.co.uk/Search.aspx?...=XM22Y&DOY=1m6 5A 13.8V DC PSU XM22Y £19.99 __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez And http://www.silicontronics.com, same screen name as here.

1st June 2007, 11:35 PM	(permalink)
k7elp60	Both power supplys could use an LM338 as a regulator as it will safely handle 5A. __________________ The great thing about electronics is unlimited ways to do the job. The only limit is one\'s imagination. I generally think my way is best. Show me a different way. I have an open mind.

25th June 2007, 09:40 PM	(permalink)
Thunderchild	do you actually need a regulated power supply ? most power amps can run on a simple full wave rectifier followed by a smoothing condenser (that you forgot to mention and is essential), if you want to smoth it a bit more without too much complication use a LC filter but I'm not an expert in those __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk