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An introduction to breadboards
- Follow the instructions to make a working prototype version of the Yr7 LED torch project.
- You will need has 2 LEDs, a breadboard, two 330 ohm resistors and a 6X6 push to make switch.
- You will also need single core wire – black and red, wire cutter and wire strippers.
- Using the single core wire – black and red – cut and strip your wire to make your power leads. These will eventually connect to the power supply at 3V.
- Wire them in. Best to give a 90 degree bend at the end. Try to keep them as flat to the board as possible. Black to the negative rail and red to the positive rail.
Let’s get connected
- Using the single core red wire make a short connector lead which is going to
- Run from the positive rail into the rest of the board.
- Note LED shown for scale and I used the wrong colour wire.
- Insert your connector lead to the board.
- Next add the LED. Remember they are dependent on being fitted with
- The correct polarity so make sure the long leg is the positive.
- Trim down the legs and insert to the board as shown. Flatten side is negative.
Mind the gap
- Add a push to make switch (P2M). They are not quite square so it will only fit one way round across the gap.
- The first hoop needs to be inline with the LED’s negative leg.
Resistance is not futile!
- Why do we need a resistor?
- Grad a load resistor. It needs to be a 330 ohm.
Can you remember the values of the colour bands?
- Insert the resistor into the board. It needs to connect from the second hoop of the P2M switch to the negative rail.
- Before plugging in double check your power supply is set to 3V.
- Follow the path of the electrons and make sure everything links together.
- Electrons will not flow unless they got somewhere to go.
- When you are sure connect your power leads to the crocodile clips and switch on.
Badge It - Silver
- Complete the circuit above using the switch, LED and resistor.
Badge It - Gold
- Click on this link to learn about transistors.
- Create the circuit below for the door buzzer project on a breadboard.
- Please note, the BC548 or BC547B transistors have specific pins that need to be used.
- Look at the image below to help you with your connection.
- The buzzer will also need to be connected correctly. The long leg is positive if the sticker on the top has been removed.
- See examples below,