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Bluetooth 5.0 Amplifier Board, 2 Channel Mini Stereo Audio Receiver Wireless High Power Digital 3.5mm AUX Amp Module for Home Passive Speakers TPA3116D2 50W x 2 Fosi Audio ZK-502C

4.6 out of 5 stars 168 ratings

Price: $28.17 + $8.28 Delivery
  • 【Perfect HIFI Sound】Adopt TPA3116D2(with AM interference suppression function) chip, with excellent sound quality. It ensures that even with high power operation for a long time, THD is less than 0.1%.
  • 【Mini but Powerful】2 CH stereo output power 50watt * 2, working voltage range DC5-27V, for 4-8Ω, 50watt-200watt passive speakers.
  • 【Two Input Ways】Support 3.5mm wired input and Bluetooth 5.0 input. Bluetooth signal distance up to 49ft. With volume control and power switch, Ideal for DIY your passive speakers.
  • 【Ensure Safety】This Bluetooth amplifier board has a bottom plate and a top plate, support reverse connection protection, Over-voltage protection, under-voltage protection, Over-heat protection, Short-circuit protection.
  • 【High Power High Sound Quality】It is recommended to use a DC15V-24V power adapter with a current above 2A. We support 18 months warranty and lifetime technical service. If you have any questions, please feel free to contact us.

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Product description


ZK-502C Bluetooth5.0 2 Channel Stereo Amplifier Board has a maximum output of 50watt per channel.Use TPA3116D2 chip to bring you great HIFI stereo sound quality. With two inputmethods, you can connect using Bluetooth or 3.5MM audio cable. Suitable for4Ohm-8Ohm, 50watt-200watt 2 channel passive speakers.


Product Specifications

Model: ZK-502C

Input Mode:Bluetooth, AUX

Work Voltage: DC5V-27V(Above 2A)

Channel: 2 CHStereo Output

Bluetooth version:Bluetooth 5.0

Bluetoothtransmission distance: 50 Ft

MAX Power Output:50W x 2

TerminatingImpedance: 4 Ohm-8 Ohm

Match Speaker:30watt-200watt



Size: 3.2 * 1.98 *0.72 inch

Weight: 111g

DC socket:5.5*2.1mm


Package Contents

ZK-502C StereoBluetooth Power Amplifier Module * 1

Acrylic shell * 2

12mm Copper column* 4

8mm Screw * 8

Steel nut, screwmat * 1

20cm power cable *1

Screwdriver * 1

Knob * 1

Heat sink * 1

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4.6 out of 5 stars
4.6 out of 5
168 global ratings
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Top reviews from other countries

4.0 out of 5 stars Good but could have been better
Reviewed in the United Kingdom on 30 October 2020
Colour: ZK-502TVerified Purchase
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4.0 out of 5 stars Good but could have been better
Reviewed in the United Kingdom on 30 October 2020
I bought 4 of these, blew one up through my own fault, but 3 went into 3 bluetooth boxes I made. Pros: easy to connect, sound is great, bass and treble is good call. Cons: if you turn volume knob off and LED goes off, it doesn’t disconnect from the phone, means the sounds get diverted to switched off speaker, so you need to unplug it every time. There is a noise gate that turns the output off if there is no signal, unfortunately you can hear how it operates on quiet song intros.
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Mr. B Wright
1.0 out of 5 stars Terrible
Reviewed in the United Kingdom on 19 August 2020
Colour: ZK-502CVerified Purchase
4.0 out of 5 stars MINI con un suono sorprendente, a patto di non aspettarsi ciò che non può dare..
Reviewed in Italy on 20 August 2020
Colour: ZK-502CVerified Purchase
8 people found this helpful
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5.0 out of 5 stars Good amp for power, price and quality.
Reviewed in the United Kingdom on 10 August 2020
Colour: ZK-502TVerified Purchase
Peter White
5.0 out of 5 stars Great sound - into 2 speakers
Reviewed in the United Kingdom on 21 October 2020
Colour: ZK-502TVerified Purchase