We will assemble the transmitter circuit on the circuit trainer, hook up it up to an audio source, then use the lense made in Part 1 to transmit and project the light signal.
Study the schematic diagram to determine how the parts are hooked together.
Refer to the materials pop up window to see the different components.
Step 2:
Hook up the components on the circuit trainer.
Set the power supply to +9V DC.
Connect the speaker or earphone output of any audio source between C1 and ground as shown on the schematic diagram
Step 3:
Place the cardboard lens holder from Part 1 near the data transmitter LED (D1), so that the LED just sits inside the cardboard on the opposite end of the lens.
Adjust the 10k potentiometer (R5), until the LED lights up with no audio present.
Turn on the audio, and adjust the volume and the gain adjustment resistor (R2) until the LED intensity varies with the changes in audio.
Aim the lens and trainer towards a wall several feet away. With reduced lighting in the room, a spot of light that clearly varies with the audio should be visible on the wall.
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