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#1
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Armada M300 and RF induction from transformer.
I am using it to play midi files thru a sequencer programme {cakewalk}via a
sound module to an amplifier and speakers. When using power supply there is loud RF noise. Just using internal battery no RF noise. Works okay with a borrowed Toshiba. I noticed the Toshiba has a bigger transformer and maybe has an RF filter inside. Is there an RF filter in the Armada transformer? If not would an RF choke solve my problem ? Thanks for any help. |
#2
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"dickydoo" wrote in
: I am using it to play midi files thru a sequencer programme {cakewalk}via a sound module to an amplifier and speakers. When using power supply there is loud RF noise. Just using internal battery no RF noise. Works okay with a borrowed Toshiba. I noticed the Toshiba has a bigger transformer and maybe has an RF filter inside. Is there an RF filter in the Armada transformer? If not would an RF choke solve my problem ? Thanks for any help. The 'transformer' is in fact a switching mode power regulator. These operate at high frequencies and produce electrical noise signals that are both conducted and radiated. If the noise is entering the laptop via the wire, a clip-on ferrite suppressor may be effective, e.g.: http://www.maplin.co.uk/module.aspx?ModuleNo=32799&doy=27m8&QV=Y |
#3
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"McSpreader" wrote in message ... "dickydoo" wrote in : I am using it to play midi files thru a sequencer programme {cakewalk}via a sound module to an amplifier and speakers. When using power supply there is loud RF noise. Just using internal battery no RF noise. Works okay with a borrowed Toshiba. I noticed the Toshiba has a bigger transformer and maybe has an RF filter inside. Is there an RF filter in the Armada transformer? If not would an RF choke solve my problem ? Thanks for any help. The 'transformer' is in fact a switching mode power regulator. These operate at high frequencies and produce electrical noise signals that are both conducted and radiated. If the noise is entering the laptop via the wire, a clip-on ferrite suppressor may be effective, e.g.: http://www.maplin.co.uk/module.aspx?ModuleNo=32799&doy=27m8&QV=Y Thank you. |
#4
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Dear Group,
I have a Compaq PC clone running Windows 2000 with an HL-DT-ST CDROM model GCR-8408B. I have had no problems with it - plays CDRs and audio CDs. As birthday present for my son, have bought (second hand) 'Battle For Middle Earth' CD Rom, in original box - not a copy. (In fact, I have two identical boxed sets - by mistake...) My drive will not recognise either CDR. I have tried them in another machines CDR which recognised each of them as the Lord of the Rings CDR. My drive whirrs and chugs for a minute before asking for a disc to be inserted. Any advice welcome. TIA |
#5
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I have fitted ferrite chokes on all cables but noise still there. Could you
recommend a replacement power supply ? "McSpreader" wrote in message ... "dickydoo" wrote in : I am using it to play midi files thru a sequencer programme {cakewalk}via a sound module to an amplifier and speakers. When using power supply there is loud RF noise. Just using internal battery no RF noise. Works okay with a borrowed Toshiba. I noticed the Toshiba has a bigger transformer and maybe has an RF filter inside. Is there an RF filter in the Armada transformer? If not would an RF choke solve my problem ? Thanks for any help. The 'transformer' is in fact a switching mode power regulator. These operate at high frequencies and produce electrical noise signals that are both conducted and radiated. If the noise is entering the laptop via the wire, a clip-on ferrite suppressor may be effective, e.g.: http://www.maplin.co.uk/module.aspx?ModuleNo=32799&doy=27m8&QV=Y |
#6
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"dickydoo" wrote in
: I have fitted ferrite chokes on all cables but noise still there. Could you recommend a replacement power supply ? "McSpreader" wrote in message ... "dickydoo" wrote in : I am using it to play midi files thru a sequencer programme {cakewalk}via a sound module to an amplifier and speakers. When using power supply there is loud RF noise. Just using internal battery no RF noise. Works okay with a borrowed Toshiba. I noticed the Toshiba has a bigger transformer and maybe has an RF filter inside. Is there an RF filter in the Armada transformer? If not would an RF choke solve my problem ? Thanks for any help. The 'transformer' is in fact a switching mode power regulator. These operate at high frequencies and produce electrical noise signals that are both conducted and radiated. If the noise is entering the laptop via the wire, a clip-on ferrite suppressor may be effective, e.g.: http://www.maplin.co.uk/module.aspx?...9&doy=27m8&QV= Y A replacement PSU may do the biz. Suggest you search the web for one, eBay is a good source. Alternatively, there are universal laptop PSUs on the market. |
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