| Author |
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| miox_24 |
 Posted: Wed Jul 09, 2008 6:29 pm Post subject: |
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 yes sir ur ryt, i found & replaced a deffective shunt regulator "TL431" in the reg ckt. thanks a lot |
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| miox_24 |
| Posted: Wed Jul 09, 2008 6:22 pm Post subject: |
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| vtech |
| Posted: Tue Jul 08, 2008 3:58 am Post subject: Re: Switch Mode PSU |
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| miox wrote: |
| hi there, i have a 24 volt switching power supply that has fried its quad opamp "LM324N" i did replace the chip but it still got fried, i measured the output of the psu and it was over voltage by 200% "70-75 volts" i did check some parts eg, capacitors and resistors and some diodes and its all ok, can any one pls help tnx |
Depending on your circuit design, sounds like you may have somehow lost a feedback signal which could be many things?-w/out a diagram, it is not going to be easy. Over 200% increase in output during failure? Wow Not a very good design I might add!?
Not sure if I'd even trust using such a device as it will likely damage whatever is powering.  |
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| miox |
| Posted: Mon Jul 07, 2008 6:22 pm Post subject: Switch Mode PSU |
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| hi there, i have a 24 volt switching power supply that has fried its quad opamp "LM324N" i did replace the chip but it still got fried, i measured the output of the psu and it was over voltage by 200% "70-75 volts" i did check some parts eg, capacitors and resistors and some diodes and its all ok, can any one pls help tnx |
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