MODEL SOUNDS MSMAK50 User manual
Model Sounds™
Email; gavin@stoneybridge.co.uk Website; www.model-sounds.co.uk
Tel; 07970 88 66
Model Sounds™
Mono Amplifier Kit – MSMAK50
Build yourself an amplifier kit that can be permanently located
on your layout.
Locate it in a building or a fixed vehicle or any awkward space
enhancing your layout
Just solder the jack lead, speaker & USB lead to the board and
you are good to go
Kit Contents
(Pic 1 left to right, top to
bottom)
•1m Speaker cable
•1m USB power cable
•0.5m 3.5mm Jack cable
•50mm 8 0.5W speaker
•2165B Amplifier board
Kit Requires
•USB power supply 5.5V 1A mains plug (not supplied)
or
•2x AA batteries & clip (not supplied)
Tools Required
•Soldering iron
•Solder
•Wire cutters
•Wire strippers
Build Instructions
Before you start, familiarise yourself with the printed circuit board (PCB).
We use a KITRONIK pre-built board with the only soldering required is the
connections of the various leads.
The kit is provided with three cables which need to be attached to the PCB. Each
connection needs to go through the strain relief holes (Pic 2) as shown in the
picture and soldered on the reverse (Pic 3).
Pic 2 Pic 3 Pic4
Connect the wires
Start with the connection labelled ‘speaker’. The kit is supplied with a 1m length
of speaker cable. This will be used to connect the PCB to the speaker and can be
trimmed to suit.
Strip off the insulation on each end of the cable. Connect one end to the two
terminals on the speaker (Pic 4) and the other end to the board marked
‘speaker’.
The cable has a stripe printed on it denoting the negative core (-). The speaker is
not polarity sensitive but you may wish to connect the stripe to the pad on the
board marked stripe or ‘-‘
* The middle connection is for the power. The USB cable provided with the kit
should be connected to the PCB. The red wire connects to terminal marked
‘Red’ or ‘+’ and the black wire to the terminal marked ‘-‘
* The final connection is the audio input. Strip the insulation off the other end of
the cable that has the audio jack plug on. Solder these wires into the PCB where
it is labelled input. Connect the wire with the stripe to the pad on the board
marked stripe or ‘-‘ and the remaining wire to the terminal marked ‘+’
* Please note! The power and inputs are polarity sensitive and your amplifier will
not work if the terminals are crossed.
Model Sounds™
Email; gavin@stoneybridge.co.uk Website; www.model-sounds.co.uk
Tel; 07970 88 66
Audio equipment may be damaged if connected to an incorrectly connected
amplifier
Fault Finding
Before plugging in the amplifier check first that all terminals have a cable soldered
to them, are in the correct order, the polarity is correct and any wire has not
been soldered to its neighbour.
Plug in the USB power cable and connect to a music source, turn on both.
1) Is the speaker making any kind of sound?
Yes
•Move on to
question 2
No
•Check the power lead is connected the correct way
round.
•Check the audio input is connected the correct way
round
•Check for dry joints (PCB & speaker)
•Check for bare wires touching together
The amplifier may not work when the USB power
source is from a PC or laptop.
2) Is the speaker clearly playing your chosen sounds?
Yes
•Fault finding
complete
No
•Re-check above
Designing the Enclosure
When deciding where you with to locate your speaker and amplifier, you will
need to consider;
•Accessibility - to maintain both the PCB and the speaker
•How to mount the speaker
•How to get the cables to the correct places
•Porting to give the best audio sound
The PCB should ideally be mounted on stand-off bolts using the four corner
holes. Bolts of 3mm are suggested.
What is porting?
Speakers are transducers that rely on a space for the diaphragm to move air in
order to create sound. So bolting a speaker against, say, a bulkhead of a boat is a
recipe for very poor and muffled sound.
The speaker should ideally be mounted in a round tube or contained in a box
with free air in front and behind and a way for the sound to get out, thus giving it
a porting ability, and allowing enough air around the unit to produce a precise yet
powerful sound.
Power supply
•USB power supply 5.5V 1A mains plug (PC or laptop not recommended)
or
•2x AA batteries
Do not attempt to power this equipment from a 9V battery source as damage
will occur. Absolute maximum power supply voltage is 6Volts
Information
This kit can be used with any MP3, personal stereo equipment, or one of our
Master Speaker Units that has a 3.5mm headphone or output jack socket and
uses an amplifier IC which can output 1W of power.
Kitronik Ltd
The amplifier board (2165B) has been designed and manufactured in the UK by
Kitronik Ltd.
Thanks must also go to Kitronik Ltd for letting us use their instruction booklet in
the making of this information sheet.
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