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>> THE REPLICANT << Experimental 'Steamy & Gasoliney' Sound-System
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 Posted: Sat Mar 17th, 2018 03:26 am
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Si.
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Hi Juergen :wave:



No I haven't bought one of the mini SD-Player boards ... YET.





( mini SD-Player board )



I'm still to get one of the 'Bluetooth' sound receiving boards as well.





( 'Bluetooth' sound receiving board, with built-in amplifier )



But I did do a little bit of research on the mini SD-Player board though.

The schematics I found, I Posted on >> THE REPLICANT << Thread. :bg:

SD-Player Board ... Schematics & Research





( some of Juergens seriously  C :cool: :cool: L  steampunk DIY Victorian $4!7  ! )



I know your transmitters have some extra ^^ switches I think, sprung toggles ? L:

Each 1 potentially sending some kind of 'pulse' to the R.C. receiver I believe.

So yes, in theory, I guess one of these switches could 'pulse' the SD-player board, through it's 'tracks'.





( More steampunk brass & batteries, from Dr. Sartorius, built in The Mad Professors lab. ! )



Interesting sound possibilities, like . . .

Loco - Clanking sound.

Cat - Meeyowing !

Emilia - "Nearly at the station"

Loco - Hooter

Cat - More Meeyowing

Emilia - "Out the way $4!7 for brains !" :f:

etc. etc.



The options on the SD-Player board, are there for either built in amplifier, or line-level signal OUT to a separate amplifier.

Whether the 'pulse' from your transmitter, going to the receiver, is compatible with the SD-player board, I don't know.


L:


I also suddenly realized, that I guess because your 'Phoenix' sound board is NOT in the loco ...

... but in your 'box of tricks', I guess you can use the same 'Phoenix' board for more than 1 loco. :)





( Juergens 'Box Of Tricks' ... Built by Dr. Sartorius, in The Mad Professors lab ! )



I think with some nice sound-samples, loaded as a series of 'tracks' ...

... an interesting & seemingly random & non-repetitive sound sequence could be heard.



It's good that there is hopefully a bit of spare space in the big 7/8ths locos to fit all this in.

But I guess that space could still fill up pretty fast. :shocked:



It is a pretty good solution altogether though, for the application of sound to an R.C. loco ...

... which as I understand it, is normally pretty difficult, or impossible ?? ... :us:

... unless you are using the 'Tam Valley' DCC R.C. system.



Pioneering stuff !! :thumb:



:moose:



Si.




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 Posted: Sat Mar 17th, 2018 12:24 pm
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Toeffelholm
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Hi Si,

yes the general control of this SD card player with single switches on the Tx,
will be rather simple with a DelTang Rx65 I think. 

My thoughts at the moment are more around the "loop mode" of this device,
and trying to understand the manual how it it activated and what is looped.
Single sound files on the card, or the whole card content.

Juergen




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Actual project: 7/8" scale on 45 mm track
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 Posted: Sat Mar 17th, 2018 05:37 pm
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Si.
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Hi Juergen :wave:



I am not totally 100% sure on EXACTLY how you have your 'Box Of Tricks' wired up. L:



If you have a spare minute, can you draw a very simple 'block-diagram' of the signal-flows.

It doesn't have to show every single wire & connection etc.

Just a rectangle with the name of the device in it & an arrow to the following devices input is fine.



Very simple minimalist styleee, I'm sure you know what I mean. :)





At the bottom, I think I see the 'transmitter-board' left & clearly the 'impedance-converter-board' right. L:

At the top, I see an UNKNOWN ? connector-block & device ... ???

... followed by, I think, the 'Phoenix' sound-board in a small plastic-box ... ???

... followed by what looks like your black-plastic P.S.U. power-supply-unit ...

... & lastly, top far right, what I know is the audio 'low-pass-filter-board' we talked about. :thumb:



It might help to just draw a real quick & simple block-diagram of the boards in Emilias loco as well.

A simple pencil drawing of rectangle with a name in it & an arrow to the following device is fine.



:moose:



Si.



Actually, I think it's the 'transmitter-board' in the small plastic box ...

... & the 'Phoenix' sound-board is at the bottom left.

The thing at the top left, looks unconnected to me, what is it ?




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 Posted: Sat Mar 17th, 2018 08:22 pm
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Toeffelholm
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Hi Si,

Will see if I can find time for drawing something.
Most things you have identified yourself.


The device top left is just a relay serving as electrical load for the Phoenix board, instead of a motor.

The Phoenix board is bottom left.
The Phoenix speaker exits are connected to both inputs of the impedance-converter.
One line-in signal from the converter (there are 2, for left and right) feeds this black "Terris" box above,
which is simply the Bluetooth transmitter sending the sound signal to the loco.
The other line-in signal feeds the low-pass filter and from there the under layout speaker (blue cable on the right).

And the little plastic box contains a Rx65 R.C. receiver, controlling the Phoenix board.
Power supply is from a 10Ah power bank coming in at the top in the middle.

The direct connection to the bass speaker and Bluetooth connection to the loco speaker,
showed some slight but audible time-delay in signal transmission.
So I changed the direct connection of the bass speaker to a Bluetooth connection as well.


Juergen




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modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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 Posted: Sun Apr 28th, 2019 06:55 pm
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Toeffelholm
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I'm on the sound route again! 

I modified my loco sound test setup, and the "Sound Transmitter Box" looks like this now:





Top left is the DelTang Rx (plastic box), that controls the Phoenix sound device, bottom left.

The Rx runs in parallel with the Rx in the loco,
and the esc output delivers the velocity dependent control signal for the Phoenix sound card.

Bell and whistle are controlled via 2 function outputs of the Rx. 

Left hand of the Rx is a relay as a kind of inductive load for the motor exit of the Rx.
The  Phoenix doesn't work if there isn't a consumer. 


The speaker wires of the Phoenix sound are connected to the impedance converter,
and from there the sound signal is fed to a Bluetooth transmitter (the black box in the lid),
that transmits the signal to the loco and the under layout speaker at the same time. 


Above the impedance converter there is an audio potentiometer for volume control.
It's connected inbetween the Phoenix speaker output and the impedance converter.
It is so big, because this is a motor-driven potentiometer.
So I can control volume with my DelTang transmitter
.
And can also fade in and out the sound when the loco enters or leaves the scene.
The Connection to the Rx will be explained later if there’s any interest for this aplication.

Power supply is given by a 10Ah (nominal) power bank with a additional 12V output,
via the connector at the rear side of the chest.


The under layout speaker with the test setup for the "Low Frequency Receiver Box",
recently looks like this:











On the right you see this low pass filter device.
 
The little black-box above is the Bluetooth receiver,
receiving the sound signal from the transmitter box.

The signal is fed to the low-pass filter, and from there to an amplifier that drives the speaker.
It's an old subwoofer speaker but without any electronics inside.
So speaker and box only.



With this arrangement the low-frequency part sounds much better now.
I can turn the frequency control down to the lower limit of the low-pass filter now,
that is 22Hz, and can still hear it. 


Only the amplifier is a bit noisy, so have to look for something else. 


For completion, the "Loco Sound Receiver Unit",
still looks like this at the moment:






With speaker, Bluetooth receiver and 5V fixed voltage-regulator.


Juergen






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modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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 Posted: Fri May 31st, 2019 01:23 pm
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Toeffelholm
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If someone is still following,
here's my final setup ....


To transmit sound via Bluetooth to the bass-box speaker as well, will be too effortful,
when several locos are taken into consideration.

I tested direct connection to the bass-box, and Bluetooth to the loco again,
and with the new Bluetooth transmitter, with low latency sound,
both sound sources sound synchronized now.

Also I got back to my guitar-amp/speaker combo,
and with it's additional possibilities to influence the sound.

I got the two sound sources, sounding as one sound,
coming from the loco sufficiently perfect to my ears. 

Recorded sound sample will follow.

The Volume potentiometer is controlled by a separate ESC now
(the little thing on the potentiometer)
via my Tx2 transmitter.










Juergen




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Actual project: 7/8" scale on 45 mm track
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 Posted: Mon Jun 10th, 2019 03:32 pm
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Toeffelholm
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Here is a first sound sample Video

Toeffelholm Loco Sound Sample

The quality of the microphones in my camera is not really good, but it gives a first impression.

Juergen



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modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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