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12V 1.5A 18W USB-C power adapter for TPA31XX and TAS58XX based devices
18W USB-PD Power Adapter For Louder and Amped
Sold by Sonocotta store
$10.00
No tax for United States [change]
Stock available: 4
What is it
This is a power adapter that is recommended to be used with the Louder and Amped series of ESP32 and Raspberry Pi-based devices, that have USB-PD capability. Originally, this power adapter is a quick charge phone charger, but after testing and comparing different models, I stopped at this one as it produces no hearable noise or hissing, good power figures, and stable work with D-class amps. After using it for more than 2 years, I can recommend it as a solid choice for audio.
Features
- Color: White
- Compatible Boards: see below
- Input: 100-240V /50-60Hz
- Output: 12V 1.5A
- Adapter Power: 18W
- Plug Type: USB-C
- Certified: FCC, CE, UKCA
- Cable included: Yes (1m USB-C to USB-C)
Compatibility list
ESP32 Boards
- Louder Esparagus (DUAL model)
- Amped Esparagus (Any model)
Raspberry boards
- Louder Raspberry Pi Media Center (USB-PD model)
- Amped Raspberry Pi Media Center (USB-PD model)
Adapter Capability
-
Input Power (adapter):
12 V × 1.5 A = 18 W
-
Usable Audio Output Power (80% efficiency):
18 W × 0.8 ≈ 14.4 W total
This 14.4 W is the total continuous power available for all channels combined.
Key Formulas
- RMS Voltage:
V_RMS = sqrt(P × R)
- Output Current:
I = sqrt(P / R)
Where:
-
P= power per speaker (W)
-
R= speaker impedance (Ω)
Single Speaker (Full Power Available)
If only one speaker is connected, it can use the full ~14.4 W:
| Impedance | Power | VRMS | Current |
|---|---|---|---|
| 2 Ω | 14.4 W | ~5.4 V | ~2.7 A |
| 4 Ω | 14.4 W | ~7.6 V | ~1.9 A |
| 6 Ω | 14.4 W | ~9.3 V | ~1.5 A |
| 8 Ω | 14.4 W | ~10.7 V | ~1.3 A |
Two Speakers (Stereo Configuration)
With two speakers, power splits across channels:
- ~7.2 W per channel
| Impedance | Power (per ch) | VRMS | Current (per ch) |
|---|---|---|---|
| 2 Ω | 7.2 W | ~3.8 V | ~1.9 A |
| 4 Ω | 7.2 W | ~5.4 V | ~1.3 A |
| 6 Ω | 7.2 W | ~6.6 V | ~1.1 A |
| 8 Ω | 7.2 W | ~7.6 V | ~0.95 A |
Practical Observations
- This adapter is suitable for:
- compact desktop speakers
- low-power stereo systems
- background music applications
- The available power is modest, so:
- high-volume playback may clip earlier
- bass-heavy content can stress the supply
- low-impedance speakers increase current demand quickly
- The 12 V rail naturally limits maximum output swing, especially with:
- 6 Ω speakers
- 8 Ω speakers
Final Notes
- Always leave some headroom to avoid clipping and distortion.
- Power adapters running continuously at maximum load may become hot.
- A larger power supply can improve transient response and bass performance, provided the amplifier and speakers support it safely.
Links to code and documentation
No additional links provided for this product.
Shipping policy
Most orders are shipped the next business day morning. All shipments are tracked. Delivery time in the EU is 3-7 days, outside 2-3 weeks, depending on the distance. After 30 days, the package is considered lost - reach out for a refund or replacement.
The seller
Smart Home and DIY Electronics