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Green rectangular circuit board with silver components and black connectors, roughly 60 by 60 millimetres

ZK-502H 2.0 Stereo Amplifier Board TPA3116D2 50W+50W AUX USB Bluetooth-Compatible

SKU CH-EVK9-0JB3V

Stereo amplifier board delivers up to 50 W per channel via TPA3116D2 chip with AUX, USB and Bluetooth inputs

  • Delivers 50 W per channel at 24 V with 4 Ω speakers
  • Bluetooth-Compatible streams audio wirelessly up to 1.5 m
  • TPA3116D2 chip with AM interference suppression
  • Works from 9 V to 24 V with 4–8 Ω speakers
  • Built-in overvoltage, undervoltage, overheat, DC and short-circuit protection

ZK-502H 50W+50W Stereo Amplifier Board

The ZK-502H is a 2.0 stereo digital amplifier module built around the TPA3116D2 chip. It accepts Bluetooth-Compatible 5.0, AUX, USB flash-drive and USB sound-card inputs for flexible source selection.

For DIY speaker builds and compact audio upgrades

Suits builders adding wireless streaming to passive speakers or replacing a failed amp in a small system. Not for installations that require balanced inputs, multi-channel surround or rack-mount form factors.

24 V supply delivers full 50 W per channel into 4 Ω

At 24 V the board reaches its rated 50 W+50 W into 4 Ω loads; at 12 V output falls to 20 W+20 W into 4 Ω. Choose a power supply that matches the wattage and impedance your speakers need.

Highlights

  • Delivers 50 W per channel at 24 V with 4 Ω speakers
  • Bluetooth-Compatible streams audio wirelessly up to 1.5 m
  • TPA3116D2 chip with AM interference suppression
  • Works from 9 V to 24 V with 4–8 Ω speakers
  • Built-in overvoltage, undervoltage, overheat, DC and short-circuit protection

Specifications

No published specifications for this item yet.

Questions about this item

Will the TPA3116D2 chip or the protection circuits need scheduled replacement after long-term use?

The board uses solid-state Class D amplification with no moving parts or user-serviceable fuses; the overvoltage, undervoltage, overheating, DC detection and short-circuit protections are built into the TPA3116D2 and operate automatically without scheduled maintenance.

At what point does the 24 V power limit cap the maximum 50 W per channel output during sustained playback?

With a 24 V supply the module reaches its rated 50 W per channel into 4 Ω; the overvoltage and overheating protections will engage before the supply voltage can be exceeded, so the 24 V rail is the practical ceiling for continuous full-power operation.

How hot does the 60×60 mm board get and is there any fan noise when running at 50 W per channel all day?

The compact 60×60×29 mm board relies on passive heatsinking; at 24 V and 4 Ω loads the overheating protection activates if the die temperature rises too high, and there is no fan fitted, so operation is silent but adequate ventilation is required for sustained full-power use.

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