Have finished my rebuild of a push pull double membrane with 555 neo magnets 50 x 12.7 x 3 mm. To a single membrane using only 185 magnets per speaker using 23 micron mylar A polyester as opposed to 100 micron polythene. It was a complete success and the sensitivity was a little more and a lot lighter as well. I am quite happy with this design and I won't be building any more double membrane designs.
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New New Rebuilds
This is a rebuild of the first FRP I built over 20 years ago using ferrites and angle iron, weighed a ton. NOW I have to rebuild the membrane using the Mylar A Polyester Film, keeps me out of mischief!! The smaller one on the left I use for a sub woofer.I will also rebuild this one using the thinner membrane. I also have another like this using push pull design.This is also a future rebuild with the thinner membrane I will also remove the push pull design.
This is a rebuild of the first FRP I built over 20 years ago using ferrites and angle iron, weighed a ton. NOW I have to rebuild the membrane using the Mylar A Polyester Film, keeps me out of mischief!! The smaller one on the left I use for a sub woofer.I will also rebuild this one using the thinner membrane. I also have another like this using push pull design.This is also a future rebuild with the thinner membrane I will also remove the push pull design.
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New Amp 7.1
Will be using 5 pairs of FRP of my own design and build, 1 pair of which will be sub woofers, with my new 7.1 ONKYO Amp. I just have to rebuild one of my sub woofers using the 23 Micron Mylar A.I have already rebuilt one which was a push pull design, which wasn't an improvement on the original single membrane design hence the several rebuilds. I shall have to cut several of the tapes in half using scissors. I have quite a few yards of material for covering of the speakers. The hardest part is using my sewing machine!!??
Will be using 5 pairs of FRP of my own design and build, 1 pair of which will be sub woofers, with my new 7.1 ONKYO Amp. I just have to rebuild one of my sub woofers using the 23 Micron Mylar A.I have already rebuilt one which was a push pull design, which wasn't an improvement on the original single membrane design hence the several rebuilds. I shall have to cut several of the tapes in half using scissors. I have quite a few yards of material for covering of the speakers. The hardest part is using my sewing machine!!??
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With the help of my son I have sorted out this problem and I am now able to send pictures as well!!😀
With the help of my son I have sorted out this problem and I am now able to send pictures as well!!😀
you could use this handy little device to test your field.
All you need is a signal generator which can be an amplifier and cd player playing a tone at very low level.
And a scope or digital voltmeter. jer
http://www.diyaudio.com/forums/plan...transformer-ribbon-tweeter-2.html#post2504316
p.s. I love the you tube video and I can definitely tell they have great sound even with the cheapy microphone. great job! jer
All you need is a signal generator which can be an amplifier and cd player playing a tone at very low level.
And a scope or digital voltmeter. jer
http://www.diyaudio.com/forums/plan...transformer-ribbon-tweeter-2.html#post2504316
p.s. I love the you tube video and I can definitely tell they have great sound even with the cheapy microphone. great job! jer
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No need already full range, have enough work with the rebuilds., using the 23 um mylar A. Improving the design would need a total rethink. Which at this moment in time is beyond me.😕
will be putting my re-builds in place all 13 of them onthe ceiling at the moment I am making the speaker cable from 1 mm cable. Hard work on the fingers plaiting that much cable. Have been hindered by toothache so I am a bit behind schedule at the moment. Am using a 7-1 amp to drive the 13 speakers. Already have 8 normal speakers which I built years ago. Using a separate 5-1 amp. Will send pictures when finished.
FULL SET UP FOR 9-2 AMP.
The photo show the full range planars in position on the ceiling they only weigh 5 kilos each so no problem there. All I have to do is wire them all up. This is harder than making the speakers, especially at my age. Will be glad when it is all finished. I have got to make some more cable another 76 feet should be enough (I hope).😀 The last photo is a repeat shouldn't be their. Now the pictures have disappeared?!!?
The photo show the full range planars in position on the ceiling they only weigh 5 kilos each so no problem there. All I have to do is wire them all up. This is harder than making the speakers, especially at my age. Will be glad when it is all finished. I have got to make some more cable another 76 feet should be enough (I hope).😀 The last photo is a repeat shouldn't be their. Now the pictures have disappeared?!!?
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I had difficulty cutting photos to size. Ignore the cable in the last photo it has been taken down. I didn't put the 4 speakers on the floor in the photo line up. Including these, their will be 13 speakers all together, including 2 ferrite sub woofers. I have not decided what to cover them with at the moment. Can't wait to fire them up, should be sometime next week, hopefully!!
Covered 5 Kilo Full range speakers for9.2 Amp.
my covered speakers in position , the next one is a new rebuild , doubled ferrites so too heavy will remove half the magnets and use thinner membrane and 4.5 mm wide foil. My new ONKYO Receiver and my old Sony one which I use with my 3 old pairs, which I built 40 years ago, and my old Revox which I bought in 1972 and it's still working.😀
my covered speakers in position , the next one is a new rebuild , doubled ferrites so too heavy will remove half the magnets and use thinner membrane and 4.5 mm wide foil. My new ONKYO Receiver and my old Sony one which I use with my 3 old pairs, which I built 40 years ago, and my old Revox which I bought in 1972 and it's still working.😀
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Rebuild which got lost.
Have put rebuild in this time. The other two I reversed the 2 speakers because of cable restraints, from the original positions.😎 Do you like the Holographic material on the rebuild? It looks lovely in the sun. Have 2 in the sun room covered in Holographic material.
Have put rebuild in this time. The other two I reversed the 2 speakers because of cable restraints, from the original positions.😎 Do you like the Holographic material on the rebuild? It looks lovely in the sun. Have 2 in the sun room covered in Holographic material.
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I like the colors!
And I especialy like analog tape decks!
I bet that ole' Revox sounds Sweet!
Here are some pictures of mine.
jer
P.S. Sorry to be off subject a little but I just love tape decks as these are only a few of what I have! he,he
And I especialy like analog tape decks!
I bet that ole' Revox sounds Sweet!
Here are some pictures of mine.
jer
P.S. Sorry to be off subject a little but I just love tape decks as these are only a few of what I have! he,he
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wow you have a few tape decks, where do you keep all those, you must have a big house Jer. I have about 3 ferrographs and Akia M 8.Also got a Aiwa AP2600 Turntable I bought more than 40 years ago and that still works. My living room is jam packed with stuff also the rest of the house and about 5 sheds and a garage as well and my loft which contains thousands of valves. Bit of a hoarder I'm afraid. Keeps my brain active at least!
Ya me too! he,he
Right now there all arranged in a 9' X 10.5' area in a 18.5' X 10.5' room.
And the overflow is in the garage aswell!
I used to to have I 10' X 20' storage bin packed full to the ceiling with stuff!
So I had to do alot of sorting (and deciding).🙁
jer
Right now there all arranged in a 9' X 10.5' area in a 18.5' X 10.5' room.
And the overflow is in the garage aswell!
I used to to have I 10' X 20' storage bin packed full to the ceiling with stuff!
So I had to do alot of sorting (and deciding).🙁
jer
James, how did you go about tensioning the membrane? How did you keep it consistent between both speakers?
Very cool work!
Very cool work!