THREE MELODY GENERATOR
INSTRUCTION SHEET
Price - Stock
No 310
Listen to audio for
the Three Melody Generator
1. Check your P.C.Board carefully for damage to the tracks. A Circuit Tester or a multimeter will help check that there are no broken tracks.
2. Bend the legs of the resistor with long-nose pliers to match its holes and push it into place against the surface of the board. Remember that the drawing is looking at the PLAIN side with the tracks away from you. When in place, bend the legs sideways a bit to stop the resistors from falling out. Solder in place - see Soldering Technique
3. Insert the IC socket. Be careful to ensure
all legs protrude through the holoes in the PCB. Solder all legs of the
socket.
4. Six PCB pins are located at the locations
shown. Solder in place.
5. The 0.1uF capacitor can be inserted and
soldered
6. Identify the LED legs. It is polarised. There
is a flat at the base of the globe. This is above the K leg, which is also
the shorter leg. Insert the LED as the drawing shows. Solder in place.
7. The battery holder is connected to the PCB pins as
shown. Solder to the PCB pins.
8 Cut the fig. 8 wire
into two appropriate lengths, one for the speaker, one for the switch.
Strip the insulation approx 5 mm from each end. Tin the ends of the wire -
See Tinning
wire .
9. The Speaker has +ve
and -ve terminals, use one length of fig 8 wire to connect the terminals to
their respective PCB pins.
10. Use the second length of fig 8 wire
to connect the switch to the chosen trigger.
11. You will find that
the legs of the HK227 are spread a little wide to fit into their
sockets. Take each IC and rest the legs on a
flat surface. Gently push down so that row
of legs is straightened a little. Repeat for the other row of legs.
Take the IC and find the locating mark on the top surface and near or at one
end. Check the drawing and push it into its socket the right way
round.
11. Insert batteries and press the switch to
test.
Trouble shooting
Troubleshooting if necessary will involve careful
checking of locations and polarity of components. Re-solder all joints and check
to make sure you have not bridged across
between any two adjacent component legs. The end
of a broken hacksaw blade sharpened on
an emery wheel is a good tool for cleaning between soldered joints.
Technology Notes
The heart of this kit is the HK221 which is a purpose built Integrated Circuit for melody generation. The output of this IC is fed directly to the speaker.
View the HK227 Datasheet