What is it

This is a power adapter that is recommended to be used with the Louder and Maped series of ESP32 and Raspberry Pi based devices. Originally, this power adapter comes from ASUS laptops, 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

Features

• Color: Black
• Compatible Boards: see below
• Input: 100-240V /50-60Hz
• Output: 19V 3.42A
• Adapter Power: 65W
• Plug Tip Size: 5.5mm*2.5mm
• Certified: FCC, CE, UKCA

Compatibility list

ESP32 Boards

• Louder-ESP32 and Louder ESP32 Plus
• Louder Esparagus (DUAL model can also be used with USB-PD power adapters)
• Amped ESP32 and Amped ESP32 Plus
• Amped Esparagus (DUAL model can also be used with USB-PD power adapters)

Raspberry boards

• Louder Raspberry Hat and Louder Raspberry Hat Plus
• Louder Raspberry Pi Media Center (DUAL model can also be used with USB-PD power adapters)
• Amped Raspberry Pi Hat
• Amped Raspberry Pi Media Center

Adapter Capability

• Input Power (adapter): 65 W

• Usable Audio Output Power (80% efficiency):

65 W × 0.8 ≈ 52 W total

This 52 W is the total continuous power available for all audio 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 (PBTL mode)

If only one speaker is connected, it can use the full ~52 W:

⚠️ Note: At 8 Ω, required voltage exceeds the 19 V supply, so actual power will be limited below 52 W.

Two Speakers (Stereo Configuration)

With two speakers, power splits across channels:

• ~26 W per channel

Practical Observations

• The 19 V supply voltage becomes the limiting factor at higher impedances (especially 8 Ω).
• Lower impedance speakers (2–4 Ω) allow higher current draw and better utilization of available power.
• The adapter is well-matched for 2×20–30 W systems, depending on speaker impedance.
• Real-world output will vary depending on:
  • amplifier design (BTL, Class-D behavior)
  • thermal limits
  • power supply sag under load

Final Notes

• Avoid significantly exceeding the voltage requirements of your speakers. For smaller speaker use DAC/AMP gain settings to reduce voltage swing over the speakers.
• This 19 V / 65 W adapter is a strong match for mid-power stereo systems, but not intended for high-power (>50 W per channel) setups.
• Always leave headroom (~10–20%) to prevent clipping and distortion.

Connector specs

Barrel jack used is spaced at 6mm hole/2mm pin, which is typically 5.5/2.5mm jack on the male side.

The screw terminal is connected in parallel to the barrel jack; you can use either interchangeably.

On the latest boards (starting from Amped-ESP32), I switched to barrel jack with thick middle pin with a 2.5mm pin, it’s a bit unusual but still common enough in the laptop world. It is far more comfortable in handling high currents, and importantly, much more sturdy and resistant to desoldering.

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.