Embedded Files
Step 1: Remind yourself how the breadboard works
Step 2: Hook up power, switch, and get an LED working
Test the LED after building the circuit below. If you don't get light, shut it off!
Do not build the circuit with the power on.
Power jack falling off the breadboard? Solder this PCB together and your worries will disappear!
Hook V+ to your positive / Red
Hook GND to - / ground / blue
Schematic Breadboard
Step 3: Solder header pins onto your amplifier integrated circuit breakout board
(the datasheet for the MAX9744 IC, should you be curious)
You need two 22-pin lengths. The short end of the pins will insert from the side of the board that does not have a black box.
Step 4: Hook up the amplifier integrated circuit Voltage and Ground
Schematic Breadboard
Note: 11 and 34 are labeled GND on your board. 5 is labeled VIN
Step 5: Hook up the analog audio input
Start by finding these three items below. And soldering them together as shown.
look for the tiny flame logo for orientation
Step 7: Hook the audio input to the amplifier IC.
Take note of the pins on the audio jack breakout board. Here's a picture of an audio plug mating with a jack.
We don't need all the pins! We need tip, ring, sleeve to GND
Schematic Breadboard
Step 6: Hook up the volume, its required voltage regulator, and the bias capacitor
Schematic Breadboard
Step 7: Hook up the speakers along with their capacitors and ferrite beads
Schematic Breadboard
The complete schematic (we haven't hooked up Bluetooth yet)
Step 8: Test without bluetooth
If your circuit does not work, turn it off immediately!
DO NOT MOVE FORWARD. Do not sit with it turned on.
See the troubleshooting section below
What if your circuit doesn’t sound great? (has some static for example)
This usually means that one thing is plugged in wrong. Check the audio in and speaker hook-ups OR something is a little loose. Sometimes it's the device you're testing with, try at least one other device.
Check out the troubleshooting tips below.
Troubleshooting
☐ Is the power cord or battery plugged in?
☐ Do you have power getting to the circuit (LED should be lighting up)?
☐ Is the audio cable plugged in?
☐ Did you add a switch? Is it turned on?
☐ Is the circuit sitting on something metal or conductive?
☐ Is your volume at 30% or greater and does your audio device play through other speakers?
☐ Are all parts of the schematic correct? Circle parts that are confusing for you.
☐ Make sure polarized components are not backward.
☐ Make sure integrated circuit is not upside down.
☐ Is your soldering good in ALL PARTS OF THE CIRCUIT?
☐ Is the soldering good with no short circuits on audio jack?
☐ Are speakers well-soldered and/or correctly attached?
☐ When I turn the circuit on and measure the voltage with the multimeter (touch + and GND on the circuit board the value is ______________.
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