| Amount | Item | Total price |
|---|---|---|
| 1 | Raspberry Pi 3 | €44,95 |
| 1 | IQaudIO Pi-DigiAMP+ Also known as Raspberry Pi DigiAMP+ |
€34,95 |
| 1 | Waveshare 7 inch QLED Touch Display with development board |
€77,50 |
| 1 | NFC PN532 kit | €4,65 |
| 1 | Power supply 24V @4A *(see notes at the bottom) | €34,95 |
| Subtotal | €197,00 |
The speakers are based on the DIY speaker design "Overnight Sensations"
| Amount | Item | Total price |
|---|---|---|
| 2 | Dayton Audio DNR-10 10 Ohm 10W | €2,98 |
| 2 | Dayton Audio DNR-6.0 6 Ohm 10W | €2,98 |
| 2 | Dayton Audio DMPC-0.22 0.22uF 250V | €2,50 |
| 2 | Dayton Audio DMPC-1.5 1.5uF 250V | €2,90 |
| 2 | Dayton Audio DMPC-2.2 2.2uF 250V | €3,70 |
| 2 | Dayton Audio DMPC-6.8 6.8uF 250V | €6,50 |
| 2 | Jantzen 1204 0.35mH 20 AWG | €7,70 |
| 2 | Jantzen 1078 1.1mH 18 AWG | €18,90 |
| 2 | Dayton Audio ND20FA-6 Tweeter | €29,90 |
| 2 | HiVi B4N Aluminum Midbass | €44,90 |
| 2 | Perforated PCB 95*70mm Alternative: Crossover PCB for the Overnight Sensations |
€5,90 $20,00 (€18,70) |
| 1 | Speaker damping | €10,45 |
| 1 | 1 meter of 32mm PVC pipe for water drainage | €2,79 |
| 2 | 90 degrees bend for 32mm PVC pipe | €1,90 |
| Subtotal | €144 |
| Amount | Item | Total price |
|---|---|---|
| 1 | Elm wood plank 20x160x1,8cm | €21,45 |
| 1 | MDF 61c122x1,8cm | €16,49 |
| 2 | 2m loudspeaker cable 1,5mm2 | €6,00 |
| 2 | TTP223 Touch-Knop Module minimum order of 10, only 2 needed |
€0,94 (10st) |
| 1 | Rotary Encoder | €1,94 |
| 1 | Rimini knob - matt brass 50mm | €19,21 |
| 1 | 22mm metal toggle switch | €4,10 |
| 1 | Speaker stands | €8,59 |
| 1 | Self-adhesive speakerwire foam | €2,23 |
| 1 | 2x20pin Dupont connectors + terminals | €4,30 |
| 1 | PCB terminal minimum order of 10, only 1 needed |
€1,45 |
| 1 | Braided heat shrink cable sleeve diameter 6mm, length 3m |
€2,95 |
| 1 | 5.5x2.5mm panel mounted DC connector | €0,75 |
| 1 | CAT6 ethernet panel mounted connector | €2,73 |
| 1 | Rubio Monocoat Oil Plus 2C Pure 100+30ml | €30,45 |
| 1 | Matt white paint | €8,95 |
| Subtotal | €132,53 |
Total cost: €473,53
Notes:
To be clear, use all this information at your own risk. I'm not an expert at in this matter at all, and I also rely on information I found online (see resources). So I highly recommend you do your own research in this matter.
*The digiamp+ can take any power supply ranging from 12-24V DC, with the recommended power supply being 19V, 3.4A (65 watt) DC. That being said, the input voltage does effect the output power per channel. Since the speakers are rated at 25 watts RMS and an impedance of 8 ohms. A recommended amplifier would need 37,5 watts per channel output. At 19V, 8 ohms the IQaudio DigiAmp+ povides an output of 21.3 watts. While at 24V, 8 ohms the IQaudio DigiAmp+ povides an output of 36 watts. And since there is a higher output it also requers a higher input, so a 24V, 4A (96 watt) DC power supply.
But even with a supply voltage of 24V the IQaudio DigiAmp+ is slightly underpowered. So if you would want to use the speakers at maximum volume this could cause problems. But (at least for me) the point of a jukebox is to provide some background music and its not meant to be used at the maximum volume. So then what would the maximum volume be? Well the speakers have a sensitivity of 83 dB 1W/1m. Wich means that at a listing distince of 1 meter a single speaker has a maximum output level of 96,3dB@21,3 watts and 98,6dB@36 watts. Or at a more reasonable lisiting distance of 4 meters this becomes 84,3dB@21,3 watts or 86,6dB@36 watts.
| Power supply voltage | Output power, 8 ohms | 1m listing distance | 4m listing distance |
|---|---|---|---|
| 19V | (2x) 21,3 watts | 96,3dB | 84,3dB |
| 24V | (2x) 36 watts | 98,6dB | 86,6dB |
For reference, sounds above 85dB are considered harmfull, while normal level to listen to music would be more around 70dB.
Resources:
Choosing the right amplifier for your speakers
TAS5756M Class-D Amplifier
Understanding speaker sensitivity