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?
•Move on to
question 2
•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?
•Fault finding
complete
•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.
