A Technology & Design STEM Resource

The following STEM funded project was developed by Sean O’Connor. This is an excellent example of a design opportunity that is very topical and will no doubt appeal to many young Technology students.

The project has been selected for the following reasons:-

• the design element is achievable by most pupils;• the project is topical and appropriate for the development of research / thinking skills;• it is ideal for modelling in card, paper, etc;• this project could be easily simplified for the low achiever and yet will stretch and challenge the more capable students;• an excellent example for modelling in 2D or 3D CAD / Solid Works;• it could be manufactured in a relatively short period of time;• it promotes further development using electronic systems; • I believe many students will receive great pleasure in taking this exciting project home.

I have no doubt that many students will develop their Technology and Design skills in engaging in this very worthwhile task. May I take this opportunity to thank Sean for this excellent resource. Raymond Moffatt WELB.

Portable speaker with sound responsive LED’s

Developed by Sean O’Connor

Your Brief:To design and manufacture a portable speaker with sound responsive LED’s. This product is to be designed as a accessory for your MP3, ipod, phone, Portable radio etc.

23.

Research

Design

Manufacture

Circuit TheoryHow a transistor works!

Circuit TheoryTurning sound to light using a transistor

The LED’s illuminates when the circuit detects a high amplitude waveform. It can be connected to a Walkman, ipod, Phone, mini radio with earphones. This waveform is amplified by a transistor which acts as an electronic switch turning on and off the LED’s to the sound/loudness of the music

The LED’s illuminates when the circuit detects a high amplitude waveform. It can be connected to a Walkman, ipod, Phone, mini radio with earphones. This waveform is amplified by a transistor which acts as an electronic switch turning on and off the LED’s to the sound/loudness of the music

3V

Task: Now draw the circuit diagram for the circuit to the left.Draw this circuit diagram using the components above.

Task: Now label the components used in the circuit above

Circuit Theory

Part A: MUSIC TO Light. The LED’s illuminates when the circuit detects a high amplitude waveform. It can be connected to a Walkman, ipod, Phone, mini radio with earphones. This waveform is amplified by a transistor which acts as an electronic switch turning on and off the LED’s to the sound/loudness of the music.

Part B: SOUND. The second channel can be connected to produce sound through a small speaker.

Beat box circuit diagram

BC109

BC109

2x1.5V Batteries

3.5mm Audio Jack

0.4w Speaker

Rocker switch

LED’s

100n Capacitor

BC109’s

1M R 1K R

2.2K R

Beat box Printed Circuit Board

A

B

How it works! Using the right and left outputs from an earphone jack two circuits can be generated.

ResearchAs a designer research is key to developing a successful outcome, sourcing inspiration in the form of colours, features, form, materials, e.t.c from existing and similar products.

Task: Now cut and paste images onto this page and create a mood board

ants

DesignNow use your research image as an influence to style your product:

Component layout

Front of casing

Insert research image

ants

DesignNow use your research image as an influence to style your product:

Insert research image

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Circuit Manufacture

Casing Manufacture