| T O P I C R E V I E W |
| Darkthero |
Posted - Nov 08 2009 : 04:33:38 AM
Hey guys. i need a schematic that puts out 12v 2mps.
What i have:
2amp transformer This is the best transformer i have...
i have mad one with a bridge-rectifier and a 470uf (and tried others)as the filter, but.. it still doesn't want to run my IC also.. it doesn't look like it puts out 2 amps either..
Thanks for reading, and SUPER THANKS if u helped.
(Edit...Move to Power Supply) |
| 15 L A T E S T R E P L I E S (Newest First) |
| Darkthero |
Posted - Nov 15 2009 : 12:51:14 AM
they are expensive and i would like this to be in an enclosed case i have withe my plasma speaker circuit. |
| audioguru |
Posted - Nov 14 2009 : 11:52:33 PM
Since your 12V power supply cannot provide enough current then why don't you make or buy one that has enough current? |
| Darkthero |
Posted - Nov 14 2009 : 8:50:42 PM
well i cant get anything outta the power supply but a quick arc but when i plug it up to a 12v(not car bettery) battery i getta silent arc( it is suppose to do that ) |
| audioguru |
Posted - Nov 14 2009 : 7:15:41 PM
quote:
Originally posted by Darkthero
OK, but my singing arc schematic dose work. I can use a battery with it and it works fine.
Then your power supply does not work properly.
PS. Does it sound awful? |
| Darkthero |
Posted - Nov 14 2009 : 1:08:17 PM
OK, but my singing arc schematic dose work. I can use a battery with it and it works fine. |
| audioguru |
Posted - Nov 14 2009 : 12:46:32 PM
You do not need a voltage regulator and you do not need a low-dropout voltage regulator. Instead you need a power supply that can supply 2A and a circuit that works. Pin 4 turns the regulator on and off because it is the disable pin. |
| Darkthero |
Posted - Nov 14 2009 : 11:47:54 AM
so now i have a KA378R12C - Low Dropout Voltage Regulator 3A 12v . i was dont know how or if i should use lead # 4 here is link to datasheet http://pdf1.alldatasheet.com/datasheet-pdf/view/53200/FAIRCHILD/KA378R12C.html |
| Darkthero |
Posted - Nov 14 2009 : 10:54:35 AM
ok thanks that was very helpful |
| audioguru |
Posted - Nov 14 2009 : 10:35:13 AM
If the pots are set wrong then the Mosfet will blow up if the power supply does not limit the current.
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| Darkthero |
Posted - Nov 14 2009 : 07:53:07 AM
Here is my schematic http://kaizerpowerelectronics.dk/wp-content/gallery/2008_11_14_-_audioflyback555irfp250/audiomodulatedflyback555IRFP250.gif |
| Darkthero |
Posted - Nov 14 2009 : 07:51:50 AM
ok i was unable to find a 10k uf cap. so i tryed a 4700 cap and it powers the circuit for about half a second. so that makes me think that it draws too much current and discharges the cap too fast. My guess is i need a regulator. |
| pebe |
Posted - Nov 09 2009 : 12:53:08 AM
The circuitry around a 555 will only take a few milliamps. What sort of total current are you drawing? |
| Darkthero |
Posted - Nov 08 2009 : 5:54:23 PM
ok ty so i need a larger cap |
| audioguru |
Posted - Nov 08 2009 : 09:31:04 AM
470uF is far too small to filter a 2A power supply that has a 2A load. The output voltage will be full of ripple and the average DC voltage will be low. Use 10,000uF.
The peak voltage of a 12VAC transformer (17V minus the rectifier drops) is very close to the 16V max allowed supply voltage for a 555 IC. |
| pebe |
Posted - Nov 08 2009 : 08:44:58 AM
The drawing you gave was of a bog-standard guaranteed-to-work power supply. If you cannot get it to work you either have a faulty component or you have not wired it up correctly. Without more information its impossible to even suggest reasons.
Is the mains supply OK?
Is the fuse OK?
Is the transformer primary O/C?
Are you using the correct secondary connections?
Is the rectifier OK and wired in properly?
Is the capacitor wired across the low voltage output or in series?
Find the time to draw out YOUR circuit and do voltage checks at appropriate points and then you can get some help.
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