Mindsets 211-199 User manual
Inserting components:
Axial components (like resistors and diodes) need to
have their legs bent by 90 degrees. Insert component
legs through the holes indicated by the legend on the
circuit board. Be careful not to use too much force on
fragile components. Bend legs slightly apart to keep
component in place when turning over the circuit board
for solder
Soldering
Use a soldering iron not more than 40W power and
ensure the tip is clean. Apply a small amount of solder
to tin the tip. Use the soldering iron to heat up both the
component leg and pad for about one second.
While keeping the soldering iron in place touch the end
of the solder to the leg and iron, as the solder melts
move the solder in ensuring it flows over the pad and
component leg making a smooth joint.
Allow the solder to cool for a few seconds then snip off
the excess component leg just above the solder joint.
Periodically clean the tip on a damp sponge. Re-tin the
tip before powering off your soldering iron.
Resistors
To select the correct value, check the colour code in the
table below. Use a multimeter to check the resistance if
you are unsure (be careful when checking resistors more
than a few kilohms, as the resistance of your skin could
alter the reading).
Qty Value Part Name
2 1.5 kΩ R2, R8
4 2.2 Ω R5, R6, R11, R12
2 5.6 kΩ R1, R7
2 22 Ω R3, R9
2 470 Ω R4, R10
Diodes
Diodes need to be inserted the correct way around.
One end of the diode will have a stripe around the case,
match this end to the stripe show on the circuit board.
Qty Value Part Name
4 1N4148 D1, D2, D3, D4
Capacitors
Electrolytic capacitors must be inserted the correct way
round. The longer leg is positive and should be inserted
into the hole marked with a + symbol on the circuit
board. The shorter negative leg is usually marked with a
stripe containing – symbols on that side of the capacitor.
Qty Value Part Name
2 2.2 µF C1, C3
2 1000 µF C2, C4
Low Power Audio Amplifier Kit
Code: 211-199
R6
Watch out for ‘dry’ joints, where the solder has not
adhered properly to the leg or to the pad.
Anode
Cathode
Negative
Transistors
To identify the correct transistor, match the code in the
device column in the parts list to the text printed on the
transistor casing. e.g. BC548. Ensure the flat side of the
transistor matches up with the marking on the circuit
board.
Qty Value Part Name
4 BC548B Q1, Q3, Q5, Q6
2 BC558B Q2, Q4
Connectors
When soldering the terminal blocks, ensure that the
access hole for the speaker wire faces outwards from the
circuit board. When soldering the battery connector
leads, make sure the red wire goes to the pad marked
with a + sign and the black wire to the pad marked with
a - sign. Both leads can be looped through the hole next
to the pads to prevent the wires breaking loose.
Qty Value Part Name
1 Stereo Jack X1
2 Terminal block SPK-L, SPK-R
1 PP3 Connector +, -
Input
3.5mm jack socket (stereo). To connect to an audio
source (for example, an MP3 player), use a 3.5mm Stereo
Jack to 3.5mm Stereo Jack cable.
Output
Pair of two-way screw terminals for left and right
speakers. Wire a 4Ω or 8Ω speaker to each terminal
block. Both left and right speakers should be the same
type.
Collector (C)
Base (B)
Emitter (E)
Power Supply
Connect 6V to 12V via the PP3 connector. For example,
a 9V PP3 battery, or a 4xAA battery box with PP3
connection.
Optional – Bypassing the Jack Connector
It is possible to bypass the jack connector and wire
the input signal directly to the board. Three pads are
available so a direct connection can be made:
GND Ground
LFT Left audio channel
RGT Right audio channel
IMPORTANT NOTE: Under normal use, when no plug
is inserted, the jack socket internally connects both left
and right input channels to ground. This is a standard
technique that prevents pick-up of unwanted noise. If
the socket is to be bypassed two tracks must be cut so
the inputs are not shorted to ground (see diagram). To
prevent any damage to equipment, discontinuity should
be verified with a multimeter (or other suitable device)
before any connection to the amplifier is made.
cut the tracks where marked
by the white lines
Supplied by: Mindsets (UK) Ltd., Web: www.mindsetsonline.co.uk
