[population of birds

This post has been edited by swifbuild: Jan 18 2008, 07:51 PM

The 4" PVC pipe tweeter I made is for mid range. 2 feet long. The advantage is sound can reach upt to 500m away and the disturbance to neibouring houses can cut down up to 50%. I will make long range tweeter later. With 4 feet long pipe. Hopefully sound can reach up to 1km and nearby disturbance cut down to 70%. Of course cone shape is better. But will be harder to make. Need to use zinc or aluminium and will require some welding and grinding jobs. Nest Tech is selling those type of mid-range and long range tweeters. Their specs performance is mid-range up to 500m with 50% less disturbance and long range up to 1km with 70% lesser disturbance. Mine are "home made" sure cannot compare with their performance. I've compared with and without PVC pipe. The disturbance really lesser and at range of about 40m I compare, same level of volume. I can hear the PVC pipe tweeter louder than just bare tweeter. So it really works, easy to make and most important. Cheap! Cost of making less than RM10. Anyone know how much Nest Tech selling their mid and long range tweeters? The concept is like fishing rod. At the same force apply with longer rod we can throw longer range than shorter rod. I have an idea of putting more than 1 piezo tweeter inside the pipe. Since the pipe will act as its cone, I'll cut off the cones of round piezo tweeter so can fit in more than 1 tweeter. Nest Tech's mid and long range tweeter using 4x piezo inside. Without the big cone I'll try to fit in 4x piezo fit in 4" PVC pipe. If not 2-3 tweeters also good enaugh.

If you are trying to cut down the sound to your neighbour, would wrapping the outside of the PVC with say polyurethane foam will dampen the sound even further? What is the idea of putting more tweeter inside the PVC? Can we jut put 1 tweeter but very powerful one in term of wattage?

Because the pipe tweeters are pointing 45dg to 60dg upwards. Rain/water proof must be considered. For water proof as far as I know only piezo-electric tweeters can be used. You are right. By wrapping the pipe with sound damping meterial outside or apply to inside wall is a good idea. This can cut down disturbance and may be can increase range.

p/s pics borrow from www.nesttech.com.my


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I would not apply the damping material to the inside wall as you want the sound wave to travel far. The reflecting wall is needed for the sound wave to travel. You just want to dampen the sound that is caused by the vibration of the PVC wall. If you apply the inside wall with damping material, only unreflected sound wave will be transmitted (the one that does not hit the inside wall) and therefore the amplitude of the sound that you intend to travel far will be reduced.

Actually I mean using sound proof material for inside wall. Such as Sonotube. The material people use for custom made speakers and woofers. But these kind of material sort of hard to get.

Hi Seeseng

i just shipped the CD's to you.
i think you will received it tomorrow or wednesday.

Inside the package have 2 cd. one internal and one external. i have labelled the CD's as well.

when you can ship yours to me?

Hi guys, can I joint you guys with the CD exchange? This way. we can add our collection in a cheaper way. Even though I live in Indonesia, I think the postage is still a lot cheaper than buying new ones.

Hi Liurmas

Can you PM me with your name, address and phone?
i will ship to you once you have provide me the details.
i will also PM you my name, address and phone so that you can send the CD's to me as well.

cds sound is fun

This post has been edited by swifbuild: Jan 18 2008, 07:52 PM

Hi Swifbuild

Where you working? i work at PJ Sec 13...
perhaps i can meet you up somewhere to pass you the CD as well...

working who wants

This post has been edited by swifbuild: Jan 18 2008, 07:52 PM

my farm is in pahang but i work in KL.
i'm doing IT. which part of shah alam?

at section 27, Near Sharp factory.

0

This post has been edited by tongserseng: Feb 9 2009, 12:05 PM

Received your CDs today. Haven't test power yet. Sent you 3 CDs by Poslaju today to your Mentakab address. The address no mistake? House number then taman name then Mentakab. No street number?

okay...
no street number... is just a small taman only.

i have bought the hormone from nesttech. Now looking for pressure sprayer.

My consultant just help me to spray some potion last 2 weeks. Can i spray again using nesttech potion?

For tight budget I also choose to buy the hormone from Nest Tech. It's RM280 for 5L or 4.5L? Their quotation to me stated 5L.
What type of potion your consultant sprayed? If it's 30 days potion then wait after 30 days to spray the hormone lah. No need to waste.

it's 5L. shipping fee is RM40.
their shipping very fast also... after you receive the hormone, can you try smell it? i have smell the hormone and i totally dunno how to describe the smell...

sigh... i have no idea what the heck my consultant spray... cos i'm not available. my dad told me it's a pink color liquid... thats what i know. sigh...

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Added on May 31, 2007, 10:55 amHi Swifbuild.

i have shipped the CD for you this morning. you should received it by tomorrow.

Hi Liurmas.

Please be patient. I will shipped the CD to you within these 2 days

This post has been edited by weihow_2000: May 31 2007, 10:55 AM

seeseng.

what kind of pressure sprayer you use?
How much you buy for the sprayer?