Acoustic smoker trials

Smoke creating devices!

Postby tom_tom_go » Sun Feb 24, 2019 3:56 pm

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I believe the smoke output is poor because the speaker I am using (8ohms 3watts) is not loud enough but the design seems to work as the louder sound of the horn produces more smoke than the engine running sounds.

The amp is 5watts so I believe this should be sufficient?

The heating element is running at just over 7 volts and increasing the voltage only makes a slight difference in the smoke output from the exhaust.

Any thoughts please let me know!

Tom
Last edited by tom_tom_go on Thu Feb 28, 2019 9:33 pm, edited 1 time in total.

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Postby 43rdRecceReg » Mon Feb 25, 2019 12:33 am

Is the Amp the weakest link? Presumably, a stronger input from the amp ought to drive the speaker harder, and produce more smoke from the unit in consequenece..in theory.
An interesting experiment, nonetheless. Also, I like the loco's 'whistle' sound. :D
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Postby midlife306 » Mon Feb 25, 2019 2:55 am

Just change to a 4 ohm speaker
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Postby tom_tom_go » Mon Feb 25, 2019 10:45 am

The power supply to the amp is 12v (max allowed) so I don't think this is the issue.

I did try a physically larger sized 4ohms 2watt speaker I ripped out from a broken music dock but this performed worse than the current speaker.

I managed to order the AuraSound Cougar NSW1-205-8A 1" speaker that seems to have been used by most of you on here from an European supplier so I will see how that performs with my amp.

What wattage does the sound amps in the popular RTR tanks run at out of interest?

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Postby 43rdRecceReg » Mon Feb 25, 2019 12:29 pm

tom_tom_go wrote:The power supply to the amp is 12v (max allowed) so I don't think this is the issue.

I did try a physically larger sized 4ohms 2watt speaker I ripped out from a broken music dock but this performed worse than the current speaker.

I managed to order the AuraSound Cougar NSW1-205-8A 1" speaker that seems to have been used by most of you on here from an European supplier so I will see how that performs with my amp.

What wattage does the sound amps in the popular RTR tanks run at out of interest?


Wayne's suggestion makes sense. Maybe you could use a simple inline variable resistor/ rheostat like the volume switch that comes with Taigen tanks? (HL now use a button on the TX)
When my old iMac died, I took the speakers out for 'may- be -useful- someday' reasons. But chucked them, when decluttering. Quality speakers like those, however, are small enough for tanks, and locos.
Maybe get one from an old Roberts radio. They made great wee speakers. :thumbup:
A quick look at the IBu2 and Clark T60 models, shows that their amps are rated at 15 watts respectively.
I don't think that HL and Taigen advertise the power ratings of their amps, but I could be wrong.
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Postby tom_tom_go » Mon Feb 25, 2019 12:45 pm

This is the amp I am using (the website is wrong regarding the amp wattage, it is 5watts):

https://www.mtroniks.net/prod/Sound-Sys ... d5mSDT.htm

The volume is adjustable and I have it on max.

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Postby 43rdRecceReg » Mon Feb 25, 2019 1:00 pm

tom_tom_go wrote:This is the amp I am using (the website is wrong regarding the amp wattage, it is 5watts):

https://www.mtroniks.net/prod/Sound-Sys ... d5mSDT.htm

The volume is adjustable and I have it on max.

I don't think 5 Watts is probably enough. :problem:
A 15W amp could be run on a 7Vdc (and up) at roughly 4 ohms. This corresponds approximately with the output of the IBU2, and Clark tank units, to speakers, I guess. They can make quite a din! A quality speaker can make a quality din :lolno:
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Postby midlife306 » Mon Feb 25, 2019 9:43 pm

Thinking about this on a loooong drive today, you’re relying on the speaker to move the air for your smoker hmmmm...
If you put a low pass filter set at about 150 to 200Hz it will get rid of all the high frequency “fluff” which should give you a nice visible pulse exhaust.
Get a decent 4ohm speaker & give it a blast
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Postby tom_tom_go » Thu Feb 28, 2019 9:03 pm

What a difference a speaker makes!

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Postby midlife306 » Thu Feb 28, 2019 11:18 pm

So what did you use??
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Postby 43rdRecceReg » Fri Mar 01, 2019 12:24 am

Yes, Tom, like Wayne, I'm wondering what speaker you're now using in order to achieve that increased output? :|
By the way, have you seen this acoustic smoker setup before, in a King Tiger? This one looks eco-unfriendly, really but convincing, at the same time. Cough, cough!
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Postby c.rainford73 » Fri Mar 01, 2019 1:03 am

Remarkable results please do tell all the details :clap:
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Postby tom_tom_go » Fri Mar 01, 2019 4:00 pm

I like the acoustic smoker setup in that King Tiger (that's on the shortlist for my first tank purchase as it has lot's of space inside for modifications).

My version of an acoustic smoker is similar to strmnd54 efforts using the same speaker (Aura Cougar NSW1-205-8A) which has made all the difference from my first attempt!

The smoke unit is cut from a 2018 Heng Long smoker and the only mod on that so far is I screwed the top the other way round so the heating element is not blocking the original air hole on the side (where the piston would be to pump air into the smoke unit). I am running the heating element at around 7v using JT's Mega Steam.

Once I get it all fitted inside a loco I will see if further adjustments are required but pleased with it so far ;D

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Postby 43rdRecceReg » Fri Mar 01, 2019 4:24 pm

Yes, that KT setup makes smoke absolutely proportional, and in sync, with the engine revving. That's one cool set of effects all round. Judging by the hermetically sealed setup of speaker and box, it has to be the back pressure from the speaker, channelled through the smoke chamber, that drives the smoke out. :) A very neat solution. :thumbup:
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Postby tom_tom_go » Sun Mar 03, 2019 1:09 pm

Not happy running this at such a high voltage, it get's very hot over a period of time.

The speaker set up works fine, the issue is the heating element as at a lower voltage not much smoke is produced but at a higher voltage it belches out smoke.

I can't find a wire round resistor to suit so I was wondering if a heating coil of some sort would work?

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Postby tom_tom_go » Sun Mar 03, 2019 10:05 pm

Snug fit but it works!

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Postby Vertigo » Thu Mar 07, 2019 5:45 pm

Good thread this, great work.
Seen a few threads on acoustics but can't find the detail on how the speaker is attached and the flow managed.
I assume the standard unit has a one way valve to ensure the air only goes in the inlet. Is this still in place when you attach the speaker?
Ive not seen any details for a valve on the home made smokers.

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Postby tom_tom_go » Sat Mar 09, 2019 9:02 pm

The plastic cap that covers the speaker is from a handcream product (I obtained various plastic caps from around the house before I found one that fitted!)

The nozzle hole is unmodified on the plastic cap and is around 4mm. The crucial part of making this particular acoustic smoker is the air gap between the speaker and the smoke generator:

IMG_20190309_194442-01.jpeg
IMG_20190309_194432-01-01.jpeg

The original air hole on the smoke generator is plugged with a screw and PTFE tape and a new hole was drilled on the opposite side so that the speaker cover could be centralised. I used epoxy glue to attach the speaker cover + smoke generator to the piece of wood that provides a suitable air gap as this can withstand tempature change.

It's all very much trial and error and the speaker, heating element voltage and amplifier will vary results.

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