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Stuka Siren

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Stevo19/05/2017 18:58:28
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2376 forum posts
634 photos

Hello All,

I'm no stranger to electronics design and building. I'm exploring the idea of a Stuka Siren, going into a 1.8m span aircraft. Don't fancy shelling out £120 for one... anyone made one or want to share ideas?

Rob Fairweather 119/05/2017 20:28:04
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41 forum posts

Someone better aquainted to this site will come along shortly and fill in the gaps in my posting, but I seem to remember that a UK kit manufacturer making one that was mentioned a couple of months ago ?

Edited By Rob Fairweather 1 on 19/05/2017 20:28:48

Denis Watkins19/05/2017 20:49:25
1476 forum posts
65 photos

Electronically Stevo, this is no way difficult to realise. The bug is the speaker, which by definition, has to be heavy to make enough noise, and be mounted on a noisy bit in the model.

Noise maker design comes in 2 forms for us. We can record and playback the siren.

Or noise generate the siren electronically. Do not pay £120 for one as we will root out diagrams.

An actual electronic siren is only £20, and a sound generator circuit chip, about £2.50

Edited By Denis Watkins on 19/05/2017 20:53:09

J D 819/05/2017 20:59:06
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601 forum posts
39 photos

A club mate had a large scale Stuka and he had the siren system in the fixed in position center bomb.idea

stu knowles19/05/2017 22:40:42
401 forum posts
28 photos

Would this work?

https://www.banggood.com/Mini-Wired-Siren-For-Wireless-Home-Alarm-Security-System-SZC-2574-p-939525.html?rmmds=detail-left-hotproducts

Stevo21/05/2017 17:16:07
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2376 forum posts
634 photos

Some suggestions thank you

The hardest part (as has been said) is the speaker. I was thinking some Piezo transducer type, as I'm hardly looking for HiFi!

Perhaps this... Arduino as an MP3 player, playing a continousy loop of the siren. When triggered from the Tx, it then turns up the volume (from 0) to a high level over a couple of seconds. When turned off from the Tx, it then turns it down, again over about 2 seconds.

Power amp? Fed from a lipo? Stereo power amplifier in bridged mono to give the voltage swing?

Tom Sharp 221/05/2017 18:38:43
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2163 forum posts
10 photos

Spinal Tap? Turn the volume up to twelve and get thrown off the field. cool

Denis Watkins21/05/2017 19:50:30
1476 forum posts
65 photos

A shop bought piezo siren is easily switched on and off electronically and is the economic route to take.

.

Stevo21/05/2017 20:21:26
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2376 forum posts
634 photos

Indeed Denis... but does it sound like a Stuka..?

Donald Fry21/05/2017 20:33:52
1503 forum posts
22 photos

Difficult question. Not many about. And you would not get me to volunteer to stand under one to find out. But in fairness, neither would your potential critics. Why not just lie to them.

Stevo21/05/2017 20:52:21
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2376 forum posts
634 photos

It's all in the ear Donald... I've sussed the sound, WAV player, amplifier... Just sourcing the Piezo driver

Stevo21/05/2017 21:00:07
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2376 forum posts
634 photos

Aha!

https://hobbyking.com/en_us/mrrc-sound-tt-25-sound-transducer.html

 

Edited By Stevo on 21/05/2017 21:17:09

Donald Fry21/05/2017 21:08:31
1503 forum posts
22 photos

Arrrrrr, Stevo, me old lad, you may have a good ear, but was your fancy WAV recorded from under the thing. Think before answering.

Stevo21/05/2017 21:14:59
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2376 forum posts
634 photos

Haha!!

I did think all this before I found the sound file. Recorded from under the aircraft, (i.e. ground level) you will hear the sound compressed... rise in pitch... and when it's out of the dive, the pitch lowers... OK.. Doppler effect.

After much searching. I found a sound file that is constant in pitch... so at least it sounds realistic when it flies past!

Martin Harris21/05/2017 22:13:55
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6721 forum posts
161 photos

But doesn't the siren increase in pitch as the airspeed increases - or did they have a speed regulating mechanism?

devil's advocate...

Donald Fry22/05/2017 07:21:37
1503 forum posts
22 photos

Could you not ditch the electronics and make a whistle.

Cliff Bastow22/05/2017 17:25:17
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639 forum posts
316 photos

I seem to remember a build article in one of the magazines where the builder used the inners from a rape alarm!

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