Electronic Christmas tree building set – luminated with music
€11.14
Electronic Christmas tree building kit v2 for beginners and advanced users.
| Title | Range | Discount |
|---|---|---|
| Discount for over 99 pieces | 99 + | €1.39 flat |
Description
Electronic Christmas tree building set – illuminated with music
v2 Electronic Christmas tree building kit for beginners and advanced.
Description:
Musical, battery-powered LED Christmas tree KIT.
Assembly time: 1-2 hours.
Recommended for: Beginner, intermediate, advanced
Required for assembly:
Pliers, side cutter, soldering iron. A 9V battery is required for operation.
Specifications:
Power supply: 9V
Operating temperature range: 10-40 ° C
Assembly
Contents of the package:
PCB: 1 pc (soldered with ISD2360 music player IC)
Resistance: 2 pcs 120 Ohms, 2 pcs 240 Ohms, 3 pcs 3.9 kOhm
Transistor: 3 pcs BC557
Capacitor: 4 100 nF, 1 330 nF, 2 100 nF
LED: 3 green, 4 red
Speaker: 1 piece,
Slide switch: 1 pc
Push button: 1 pc
Stabilizer IC: 1 pc
Battery holder: 1 pc
Parts:
Resistance: This limits the current flowing. Its value can also be determined with a resistance meter or with the color markings on it. We use 3 different values for the Christmas tree: 120 Ohm (12 * 101), 220 Ohm (22 * 101) and 3.9 kOhm (39 * 102). 4, 5 or 6 bands are used for color marking. Tolerance is always the last and the multiplier is the penultimate. The first 2-4 are the digits (mantissa).
| Color | Digit | Multiplier (4 bars) | Tolerance |
| black | 0 | *1 | |
| brown | 1 | *10 | +-1% |
| red | 2 | *100 | +-2% |
| orange | 3 | *1000 | |
| yellow | 4 | *10000 | |
| green | 5 | *100000 | |
| blue | 6 | *1000000 | |
| purple | 7 | ||
| gray | 8 | ||
| white | 9 | ||
| gold | /10 | +-5% | |
| silver | /100 | +-10% |
- Capacitor: It charges and discharges: it stores the charge and then discharges it. The component used is an electrolytic capacitor whose polarity is important. The negative foot is indicated by the strip on the side of the capacitor.
- LED: Light-emitting diode. It has two legs: an anode and a cathode. It is a semiconductor device that conducts current in only one direction (anode +, cathode -). Thus, this must also be implanted with the correct polarity. The cathode legs are shorter, this goes to the square pad.
- Transistor: Used here as a controlled switch. It has 3 legs, between the base and the emitter pin, if the voltage exceeds ~ 0.6 V, current will start. As a result, it passes a much larger current between the legs called the emitter and the collector.
- Slide Switch: This closes or opens the circuit so that operation can be turned on and off.
- Push Button: When pressed, shortens 2-2 feet.
- Speaker: This emits sound.
- Music Player IC: Stores and plays the melody at the touch of a button.
- Voltage stabilizer: It produces 3.3V of the 9-volt voltage of the battery for the IC of the music player, its appearance (housing) is the same as that of the transistors, and the type can be determined from the outside only by the inscription printed on it.
- Solder the resistors one by one, making sure they get the right value everywhere.
- Now solder the slider.
- Solder the transistors (do not mix them with the voltage stabilizer!) according to the drawing on the panel.
- Solder the voltage stabilizer according to the drawing on the panel.
- Solder the LEDs with the correct polarity (longer leg is the anode).
- Solder the capacitors according to the polarity marked on the panel. (On electrolytic capacitors, the strip is the – polarity, this foot is shorter than the other).
- Now solder the speaker.
- Solder the pushbutton from the back of the panel.
- Insert the battery holder from the back and solder it.
Setup
- Check that the capacitors are soldered with the correct polarity.
- If possible, test the circuit first using a laboratory power supply with a 9 V, 100 mA current limit. If the flashing works, raise the current limit to 500 mA to test the music player.
- To start the music player, press the button.
Possible errors and ways to fix it:
- If the circuit does not operate with a multimeter in diode test mode, check the polarity of the LEDs.
- If the flashing rate or the brightness of the LEDs is not correct, check the resistances.
- If all LEDs are lit at the same time, the vibration has not started. To do this, remove the battery and reconnect it after a few seconds.
Functional description
Operation of the circuit responsible for the play of light:
At the moment of switching on, the current is started through the base of the transistors through the 3.9 kOhm resistors, as a result of which the transistors open, current flows between the emitter-collector and the LEDs light up. When one of the transistors closes, the GND (0V) ‘+’ pin of the capacitor connected to the collector is connected to the opening voltage of the LEDs (green: ~ 2.2 V, red: ~ 1.8 V). This is ~ 4 V for transistor Q2. The ‘+’ pin of the capacitor is connected to the 9 V supply voltage through the base of transistor Q3, so it has a potential of ~ 8.4 V. So the capacitor is approx. Charges to 4.4 V. When transistor Q2 closes again, the ‘-‘ pin of capacitor C1 is at the 9 V supply voltage level, and the ‘+’ pin will be higher with the capacitor charge voltage: 9 V + 4.4 V = 13.4 V. This connected to the base of transistor Q3. When the base voltage exceeds the emitter, the transistor closes, i.e. now the transistor Q3 is closed and thus the ‘-’ pin of the capacitor C3 goes through the two green LEDs for approx. To a potential of 4.4 V. Meanwhile, capacitor C1 is continuously discharged through resistor R2, and when its voltage drops, transistor Q3 can open again and the process starts again.
For the oscillation circuit to start, one of the transistors must open earlier than the others. Which transistor will open first after switching on is random due to the standard deviation of the components (components of the same value are not the same, there may be a small difference between them.
Operation of the music circuit:
The L78L33 Voltage Stabilizer IC generates the 3.3V required for the music player IC from the 9V voltage of the battery. This IC is approx. It can store 60 seconds of audio and is pre-programmed to be soldered to the PCB. The IC is programmed to start playback when the button tied to pin 13 is pressed and to stop when the button is pressed again.
Possibility of modification:
Melody and logo exchange for 100+ orders.
Keywords: Christmas, Christmas tree, KIT, LED, musician, perforated
