View single post by Toeffelholm
 Posted: Sat Mar 17th, 2018 09:22 pm
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Joined: Sun Sep 21st, 2008
Location: Germany
Posts: 514
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.


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