SIMPLE DOOR BELL
Price - Stock
Listen to audio for Simple Door Bell
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. Six PCB pins are located at the locations
shown. Solder in place.
4. The HK592 must be inserted in the correct orientation. Check the diagrams and insert. It is recommended that a heatsink tool be used to reduce the risk of damage from heat during the soldering process. Solder in place.
5. Check the orientation of the BC548 transistor. Insert and solder in place.
6. The battery holder is connected to the PCB pins as shown. Solder to the PCB pins.
7. 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 .
8. The Speaker has +ve and -ve terminals, use one length of fig 8 wire to connect the terminals to their respective PCB pins.
9. Use the second length of fig 8 wire to connect the switch to the PCB pins.
10. Insert batteries and press the switch to test.
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.
The heart of this kit is the HK592 which is a
purpose built Integrated Circuit
for melody generation. The output of this IC is fed to the
Base of the BC548 via the 560R resistor. The
BC548 amplifies the sound for output by the speaker. See - Transistors
Contact CdS electronics