NJD SE-1 Classic Dub Siren Unit

Just to say, I build my own sirens, delays, spring reverb and pre-amp (not finished yet), can't wait to start looking at amps and bins, so there is still some originality, at least an attempt. And not a single clone, of course certain things can't be reinvented but anyway I prefer figure it out myself and learn things than just copy.
And I can't understand why a so called "dub siren specialist" can't make a siren without the schematics from another guy... 

And all the difficulties about making a copy, that's a joke right?

recent probaly dubsonic 

i think rigsmith and mr law are ok attempts but the tone is missing in my opinion

but good work same way

With the NJD siren the pitch or key is not stable, this changes based on voltage. so the tone will change depending on the battery.  here is a video to demo that. Maybe you used the Rigsmith with a power pack and voltage is a bit higher than originally intended, with a slightly flat battery it sounds best in my opinion.

temperature also has an effect but its much less than the voltage.  see this video to see how much it can vary from 3V until around 15V

https://www.facebook.com/dave.rigsmith/videos/1281804923015830/?idorvanity=385796901567056&st=84yU5nyFkg3

I dont really know what Key you want, Am is Quite common and has the same notes as C major and popular with piano as it has all white keys. Guitars play alot G Major /   A major or the relative E Minor  F minor due to open string notes. They also play Am and C Major which is popular with piano (maybe Am is the most used scale in dub music, maybe someone here knows). Horns prefer F or Bb Major and the relative minors.  I think some keys will be more common but nowadays a lot of music is totally randomly made on a computer- 

I can set the Notes however you like so long as the voltage is stable. I can also control the harmonic timbre of the note and speed of the beat control. I charge extra for this sort of tuning setup, email the website with your specification and I will quote you. 

the tone of my design is just based on that I copied 10 years ago. However in around 2018 maybe I put a 4th tone which is higher than the original 3. So not all my sirens sound exactly the same

 there is even a interview with Jah Shaka who talks about his siren being modified and custom for him. so there is even some variations on what some people say sounds like a NJD depending who's unit your listening to. 

Lleviel I think you missed the original points I was trying to make.  I grew up in Southend-on-sea not France, and even with many contacts in the UK dub sound scene finding a NJD to copy was not easy. 

The act of copying it was not hard. Finding something to copy was. People did not want everyone to have this sound and others where afraid to lone me the siren encase it was stolen or broken. Many of the clones had the part numbers scrubbed off or paint dumped all over them. I have a degree in Electronics so is not really hard to me to work out if somethings been painted and numbers scratched. But his is the sort of lengths the UK builders went to to guard that circuit.

At the time we made the drawing I was maybe one of 3 people to ever make a clone. I was a bit pissed when someone posted the design online. I am sure some of the original UK guys who put paint all over the parts would be equally pissed about it. 

Take a look at this 12 years ago I made a NJD siren using 5 NPN transistors. I listened to audio clips and made a guess how it might have been.  Shortly after I designed this I was offered other units to make a precise clone with 2 NPN and 2 PNP like you all know.  So for all you who say I did not design a siren and bah bah bah. I was asked to make this siren by elders in the dub scene and I think I was very successful both with my own design and the Clone.